OpenCourser brand icon
Sign in
Sorry, this page is no longer available
We may earn an affiliate commission when you visit our partners.
Course image
Course image
Coursera logo

Paleontology

Early Vertebrate Evolution

Alison Murray, Ph.D

Paleontology: Early Vertebrate Evolution is a four-lesson course teaching a comprehensive overview of the origin of vertebrates. Students will explore the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework. This course examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. Students also explore key Canadian fossil localities, including the Burgess Shale (British Columbia), Miguasha (Quebec), and Man On The Hill (Northwest Territories). Watch a preview of the course here: https://uofa.ualberta.ca/courses/paleontology-vertebrate-evolution

Enroll now

Here's a deal for you

Save money when you learn with a deal that may be relevant to this course.
All coupon codes, vouchers, and discounts are applied automatically unless otherwise noted.
Valid until March 12, 2027
Save 40% Off 3 Months
Access thousands of top-rated learning programs with a Coursera Plus monthly subscription and take 40% off 3 months for a limited time.
Take
40%
off
Get offer

What's inside

Syllabus

The Phanerozoic Begins
In this lesson we take you back to the beginning of the Phanerozoic Eon to learn what it truly means to have backbone, as we encounter the key anatomical features of vertebrates and their closest chordate relatives. We’ll also introduce the language of evolution – phylogenetics – as we examine some of the contenders for the title of ‘The Earliest Vertebrate’, and give you a crash course in sedimentology, so you can begin to piece together the spectacular environments that were home to our early aquatic ancestors. Just a quick note before you get started: 'Palaios' is the Greek word for 'ancient', so palaeontology or paleontology is the study of ancient life. Both spellings are correct, with palaeontology used in Britain, and paleontology more common in the US.
Read more

Traffic lights

Read about what's good
what should give you pause
and possible dealbreakers
Taught by Alison Murray, Ph.D, who is recognized for their work in the topic that the course teaches
Covers unique perspectives are ideas that may add color to other topics and subjects
Courses multi-modal and includes a mix of media, such as videos, readings, discussions, etc
Taught by Alison Murray, Ph.D, who are recognized for their work in the topic that the course teaches
If this explicitly requires learners to come in with extensive background knowledge first

Save this course

Create your own learning path. Save this course to your list so you can find it easily later.
Save

Reviews summary

Exploring early vertebrate evolution

According to learners, this course offers a largely positive introduction to the history and evolution of early vertebrates. Many found the content fascinating and well-structured, praising the clear explanations and the passion of the instructor. The focus on key anatomical features and major evolutionary transitions like the origin of fins, jaws, and limbs was particularly appreciated. While some noted the lectures could be dense at times, the overall consensus is that it provides a solid foundation in the subject, suitable for those with little or no prior background.
Pacing is generally good; difficulty is balanced.
"The pace felt just right, neither too fast nor too slow for covering the material."
"I thought the difficulty was appropriate for an introductory level course."
"The quizzes reinforced learning without being overly difficult."
"Pacing seemed fine, and the difficulty was reasonable."
Good introduction for those new to topic.
"As someone with no prior knowledge of paleontology, I found this course to be an excellent starting point."
"It provides a solid foundation and doesn't assume advanced prior learning."
"Good for beginners wanting an overview of early vertebrate history."
"Perfect for dipping your toes into paleontology without being overwhelmed."
Instructor's enthusiasm enhances learning.
"The instructor's passion for the subject really comes through and makes the lectures engaging."
"You can tell the professor is truly enthusiastic about paleontology."
"The instructor's delivery, while sometimes fast, was clearly driven by a love for the topic."
"His enthusiasm made the content more enjoyable."
Course is logically organized by topic.
"The course structure, moving through the different periods and evolutionary steps, felt very logical."
"Modules flowed well from one to the next, building knowledge progressively."
"The lessons were well-organized and easy to navigate."
"I thought the course was well-structured and easy to follow."
Instructor provides clear and concise explanations.
"The explanations for complex phylogenetic concepts were surprisingly clear."
"I appreciated how the instructor broke down complicated evolutionary steps into understandable parts."
"Concepts are explained clearly, making it easy to follow even without a background in paleontology."
"The lectures were very clear and easy to understand."
Topics are interesting and well-explained.
"I found the content absolutely fascinating, especially the sections on the evolution of jaws and limbs."
"The topics covered are truly interesting and make you appreciate the deep history of vertebrates."
"Really enjoyed learning about the ancient fishes and the transition to land."
"The subject matter is inherently captivating, and the course does a good job presenting it."
Information can be dense at times.
"Some lectures were packed with a lot of information, requiring multiple watches."
"The amount of detail in certain sections felt quite dense."
"Had to pause frequently to process all the new terms and concepts being introduced."
"Sometimes the info was dense, but overall manageable."

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Paleontology: Early Vertebrate Evolution with these activities:
Review basic vertebrate anatomy
Review the basics of vertebrate anatomy to strengthen your foundation in the subject.
Show steps
  • Read through your notes or textbook chapters on vertebrate anatomy.
  • Draw diagrams of different vertebrate body systems, such as the skeletal system, muscular system, and nervous system.
  • Take practice quizzes or tests on vertebrate anatomy to assess your understanding.
Participate in study groups with classmates
Enhance your understanding of the course material by collaborating with peers in study groups.
Show steps
  • Form or join a study group with classmates who share similar learning goals and schedules.
  • Meet regularly to discuss course topics, review lecture notes, and work on assignments together.
  • Take turns leading discussions, presenting summaries, or facilitating practice sessions.
Explore online tutorials on vertebrate evolution
Supplement your understanding of vertebrate evolution by following guided tutorials that provide additional explanations and examples.
Show steps
  • Search for reputable online tutorials on vertebrate evolution, such as those provided by universities or scientific organizations.
  • Follow the tutorials attentively, taking notes and completing any interactive exercises provided.
  • Review the material covered in the tutorials and reflect on how it complements your understanding of the course.
Five other activities
Expand to see all activities and additional details
Show all eight activities
Solve practice problems on vertebrate evolutionary relationships
Reinforce your understanding of vertebrate evolutionary relationships through repetitive practice.
Show steps
  • Obtain practice problems from the course materials, textbooks, or online resources.
  • Work through the problems independently, applying the concepts and techniques learned in the course.
  • Compare your solutions with the provided answers or discuss them with your instructor or peers to identify areas of improvement.
Create a timeline of key events in vertebrate evolution
Solidify your knowledge of the sequence of events in vertebrate evolution by creating a visual timeline.
Show steps
  • Gather information from the course materials, textbooks, and scientific articles about the major events in vertebrate evolution.
  • Organize the events chronologically and select a suitable format for your timeline, such as a flowchart, infographic, or presentation.
  • Create your timeline, accurately depicting the sequence and relationships between the key events.
  • Review your timeline and make any necessary revisions or additions to ensure clarity and completeness.
Read 'Vertebrate Paleontology' by Michael J. Benton
Expand your knowledge of vertebrate paleontology by reading a comprehensive textbook that provides in-depth coverage of the subject.
View Vertebrate Palaeontology on Amazon
Show steps
  • Obtain a copy of 'Vertebrate Paleontology' by Michael J. Benton.
  • Read through the chapters relevant to the course topics, taking notes and highlighting important concepts.
  • Complete the practice exercises or review questions provided in the book to test your understanding.
  • Engage in discussions or online forums to share your insights and learn from others' perspectives on the material.
Contribute to open-source projects related to vertebrate paleontology
Gain practical experience and contribute to the field of vertebrate paleontology by participating in open-source projects.
Browse courses on Open Source
Show steps
  • Identify open-source projects related to vertebrate paleontology, such as fossil databases, visualization tools, or educational resources.
  • Review the project documentation and codebase to understand its goals and technical requirements.
  • Identify areas where you can contribute your skills and knowledge, such as data analysis, software development, or documentation writing.
  • Contact the project maintainers to discuss your ideas and offer your assistance.
Develop a research proposal on a topic in vertebrate evolution
Deepen your understanding of the research process and apply your knowledge of vertebrate evolution by developing a research proposal.
Show steps
  • Identify a specific topic in vertebrate evolution that interests you and aligns with your learning goals.
  • Conduct a literature review to gather background information and identify knowledge gaps.
  • Formulate a research question and develop a hypothesis or set of objectives.
  • Describe your proposed methodology, including data collection methods and analysis techniques.
  • Outline your expected outcomes and discuss the potential implications of your research.

Career center

Learners who complete Paleontology: Early Vertebrate Evolution will develop knowledge and skills that may be useful to these careers:
Paleontologist
A Paleontologist is a scientist who studies the fossils of ancient organisms to reconstruct the history of life on Earth. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study paleontology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the history of life on Earth and for reconstructing the evolutionary relationships between different groups of vertebrates.
See salaries and explore the career path for Paleontologist
Vertebrate Zoologist
A Vertebrate Zoologist is a zoologist who studies vertebrates, which are animals that have a backbone. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study vertebrate zoology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of vertebrate life on Earth.
See salaries and explore the career path for Vertebrate Zoologist
Evolutionary Biologist
An Evolutionary Biologist is a biologist who studies the evolution of living organisms. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study evolutionary biology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Evolutionary Biologist
Comparative Anatomist
A Comparative Anatomist is a biologist who studies the anatomy of different organisms to understand their evolutionary relationships. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study comparative anatomy. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Comparative Anatomist
Natural History Museum Curator
A Natural History Museum Curator is a museum professional who is responsible for the care and display of natural history specimens. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to work in a natural history museum. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Natural History Museum Curator
Science Teacher
A Science Teacher is a teacher who teaches science to students. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to teach science. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Science Teacher
Science Writer
A Science Writer is a writer who writes about science for the general public. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to write about science. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Science Writer
Museum Educator
A Museum Educator is a museum professional who is responsible for educating the public about museum collections. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to work in a museum. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Museum Educator
Environmental Consultant
An Environmental Consultant is a professional who provides advice to businesses and governments on environmental issues. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to work in environmental consulting. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Environmental Consultant
Science Communicator
A Science Communicator is a professional who communicates science to the general public. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to work in science communication. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Science Communicator
Biologist
A Biologist is a scientist who studies living organisms. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study biology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Biologist
Zoologist
A Zoologist is a biologist who studies animals. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study zoology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Zoologist
Geologist
A Geologist is a scientist who studies the Earth's physical features. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study geology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Geologist
Ecologist
An Ecologist is a scientist who studies the interactions between organisms and their environment. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study ecology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Ecologist
Anthropologist
An Anthropologist is a scientist who studies human beings and their societies. This course provides a comprehensive overview of the origin of vertebrates, which is essential knowledge for anyone who wants to study anthropology. The course covers the diversity of Palaeozoic lineages within a phylogenetic and evolutionary framework, and examines the evolution of major vertebrate novelties including the origin of fins, jaws, and tetrapod limbs. This knowledge is essential for understanding the evolution of vertebrates and for understanding the diversity of life on Earth.
See salaries and explore the career path for Anthropologist

Reading list

We've selected 13 books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in Paleontology: Early Vertebrate Evolution.
Cover image
Vertebrate Palaeontology
Save
Provides a comprehensive overview of the history of vertebrate life on Earth, from the earliest fish to the evolution of humans. It valuable resource for students and researchers in paleontology, biology, and geology.
Vertebrate Palaeontology
Paperback
$$$
Vertebrate Palaeontology
Paperback
$$
Vertebrate Palaeontology 3e Instructor's Manual and...
Paperback
$
Vertebrate Palaeontology
Kindle Edition
$$$
Cover image
Brains Through Time
Save
Provides a detailed and comprehensive overview of the evolution of vertebrate nervous systems, covering the development, structure, and function of the nervous system in vertebrates. It would be a valuable resource for students taking this course as it provides a cutting-edge understanding of this important topic.
Brains Through Time: A Natural History of...
Hardcover
$$$$
Brains Through Time: A Natural History of...
Kindle Edition
$$$
Cover image
Vertebrate Palaeontology
Save
This textbook provides a comprehensive overview of vertebrate paleontology, covering the origin and evolution of vertebrates from the Cambrian period to the present day. It would be a valuable resource for students taking this course as it provides a solid foundation in the subject matter.
Vertebrate Palaeontology
Paperback
$$$
Vertebrate Palaeontology
Paperback
$$
Vertebrate Palaeontology 3e Instructor's Manual and...
Paperback
$
Vertebrate Palaeontology
Kindle Edition
$$$
Colbert's Evolution of the Vertebrates
Save
This classic textbook provides a detailed and comprehensive overview of the evolution of vertebrates, from their origins in the Cambrian period to the present day. It valuable resource for students taking this course as it provides a thorough understanding of the subject matter.
Colbert's Evolution of the Vertebrates
Paperback
Check
Colbert's Evolution of the Vertebrates
Kindle Edition
Check
Cover image
The Secret History of Sharks
Save
Provides a detailed and comprehensive overview of the evolution of fishes, from their origins in the Cambrian period to the present day. It would be a valuable resource for students taking this course as it provides a thorough understanding of the subject matter.
The Secret History of Sharks
Paperback
Check
The Secret History of Sharks
Kindle Edition
Check
Cover image
The Age of Reptiles
Save
Provides a comprehensive and up-to-date overview of the evolution of vertebrates. It valuable resource for students and researchers in paleontology, biology, and geology.
The Age of Reptiles
Kindle Edition
$
Cover image
Evolution of the Ammonoids
Save
Provides a detailed and comprehensive overview of the evolution of fishes, from their origins in the Cambrian period to the present day. It would be a valuable resource for students taking this course as it provides a solid understanding of the subject matter.
Evolution of the Ammonoids
Paperback
$$$
Evolution of the Ammonoids
Kindle Edition
$$$
Cover image
Vertebrate Life
Save
This textbook provides a comprehensive overview of the biology of vertebrates, covering their anatomy, physiology, behavior, and ecology. It useful supplementary resource for students taking this course as it provides a broad understanding of the subject matter.
Vertebrate Life (9th Edition)
Hardcover
$$$
Vertebrate Life (8th Edition)
Hardcover
$$$$
Fishes
Save
This textbook provides a comprehensive overview of the biology of fishes, covering their anatomy, physiology, behavior, and ecology. It useful supplementary resource for students taking this course as it provides a broad understanding of the subject matter.
Fishes: An Introduction to Ichthyology-...
Paperback
$$$
Fishes: An Introduction to Ichthyology (4th Edition)
Hardcover
$$$
Comparative Anatomy of the Vertebrates
Save
This textbook provides a comprehensive overview of the comparative anatomy of vertebrates, covering their skeletal, muscular, and nervous systems. It useful supplementary resource for students taking this course as it provides a solid understanding of the subject matter.
Comparative Anatomy of the Vertebrates by Kent...
Hardcover
$$$$
Comparative Anatomy of the Vertebrates Seventh...
Hardcover
$$$
Comparative anatomy of the vertebrates. 1954...
Leather Bound
$$$
Cover image
Patterns and Processes of Vertebrate Evolution
Save
This textbook provides a comprehensive overview of vertebrate paleontology and evolution, covering the history of life on Earth, the fossil record, and the evolution of vertebrates. It useful supplementary resource for students taking this course as it provides a broad understanding of the subject matter.
Patterns and Processes of Vertebrate Evolution...
Paperback
$$$
The Vertebrate Body
Save
This classic textbook provides a comprehensive overview of the comparative anatomy, evolution, and distribution of vertebrates. It useful supplementary resource for students taking this course as it provides a broad understanding of the subject matter.
The Vertebrate Body
Paperback
Check
The Vertebrate Body
Kindle Edition
Check
Cover image
A Concise Dictionary of Paleontology
Save
Provides a detailed and comprehensive overview of vertebrate paleontology and evolution. It valuable resource for students and researchers in paleontology, biology, and geology.
A Concise Dictionary of Paleontology: Second Edition
Paperback
$$$$
A Concise Dictionary of Paleontology
Kindle Edition
$$$$

Share

Help others find this course page by sharing it with your friends and followers:
Facebook
LinkedIn
Reddit
X
Link
Email

Similar courses

Here are nine courses similar to Paleontology: Early Vertebrate Evolution.
Experiments and Variations in Bipedalism
Most relevant
Our Earth: Its Climate, History, and Processes
Most relevant
Bioinformatic Methods II
Most relevant
Introduction to Genetics and Evolution
Most relevant
Journey of the Universe: The Unfolding of Life
Most relevant
Emergence of Life
Most relevant
Dino 101: Dinosaur Paleobiology
Most relevant
Paleontology: Ancient Marine Reptiles
Most relevant
Extinctions: Past, Present, & Future
Most relevant

Coursera Buyer Protection & Guarantee

Verified partner policies & purchase protections

Accredited University Partner
Free Trial & Audit

7-Day Free Trial & Free Audit

7-day free trial on monthly Coursera Plus subscriptions; free audit option available on most individual courses to explore video lectures and readings at no charge.

Return & Refund Policy

14-Day Refund Guarantee

14-day refund window on annual Coursera Plus subscriptions and single-course purchases prior to certificate issuance. Monthly subscriptions do not offer refunds once billed.

Buyer Protections

Verified Academic & Industry Partner

Accredited university and industry certifications (e.g. Stanford, Google, IBM, Yale), secure SSL payment processing, and verifiable digital certificate links.

Key Purchase Protections
14-day refund window on annual Coursera Plus and single courses
7-day free trial on monthly Coursera Plus subscriptions
Free course audit option for lectures and readings
Verified certificates from top universities & companies
OpenCourser Verified Partner Policy details last reviewed: 2026-10-22
Course image
Effort
4 weeks of study, 3-5 hours/week
Via
Coursera
Institution
University of Alberta
Instructor
Alison Murray, Ph.D
Language
English
Transcripts
Español Français Português Deutsch Italiano 中文 العربية 한국어 日本語 हिंदी Nederlands Svenska Pусский Türkçe Polski Ελληνικά українська мова magyar nyelv Română Bahasa Indonesia ไทย қазақша اُردُو, فارسی বাংলা پښتو آذربایجان دیلی
Traffic lights
Read about what's good
what should give you pause
and possible dealbreakers
Taught by Alison Murray, Ph.D, who is recognized for their work in the topic that the course teaches
Covers unique perspectives are ideas that may add color to other topics and subjects
Courses multi-modal and includes a mix of media, such as videos, readings, discussions, etc
Taught by Alison Murray, Ph.D, who are recognized for their work in the topic that the course teaches
If this explicitly requires learners to come in with extensive background knowledge first
Share this
Share to help others discover this course.
Facebook LinkedIn X Reddit Link Email
Begin learning today
Enroll now to gain full access to Paleontology.
Enroll now
Save for later
Add this course to your list. Find it anytime.
Save
Our mission

OpenCourser helps millions of learners each year. People visit us to learn workspace skills, ace their exams, and nurture their curiosity.

Our extensive catalog contains over 50,000 courses and twice as many books. Browse by search, by topic, or even by career interests. We'll match you to the right resources quickly.

Find this site helpful? Tell a friend about us.

Affiliate disclosure

We're supported by our community of learners. When you purchase or subscribe to courses and programs or purchase books, we may earn a commission from our partners.

Your purchases help us maintain our catalog and keep our servers humming without ads.

Thank you for supporting OpenCourser.

© 2016 - 2025 OpenCourser