Courses
Science
50 free courses in Science. Mathematics, physics, chemistry and biology, solved rather than only explained.
Courses to get you started
All free, all made by people who teach in public.
Crash Course Geology
by CrashCourse
3h 38m · Beginner
April 2026
Free22 lessons
Biology
by CrashCourse
10h 48m · Beginner
May 2023
Free51 lessons
Ultrasound physics
by Radiology Tutorials
6h 9m · Beginner
March 2023
Free26 lessons
Ultrasound physics course
by Radiology Tutorials
6h 9m · Beginner
October 2024
Free26 lessons
All Science courses
Nothing here costs anything. No card, no trial, no account needed to watch.
Crash Course Geology
In 25 episodes, we’re going to learn about geology—the study of Earth’s physical structure and processes. Our host, Sage, will teach you about the geological forces and cycles that shape our planet’s past, present, and future. This content is based on an introductory university-level curriculum. B
by CrashCourse
3h 38m22 lessonsBeginner1.4M views
Free
Biology
In 50 episodes, we’re going to explore biology—the science of life. Dr. Samuel Ramsey will guide you through life’s vast interconnectedness, telling lesser-known stories of biologists along the way. We’ll discover how evolution, genetics, ecology, and cell and organismal biology deepen our knowledge
by CrashCourse
10h 48m51 lessonsBeginner14M views
Free
Ultrasound physics
This is a basic ultrasound physics course designed for radiologists and radiographers looking to study for ultrasound physics or radiology physics exams.
by Radiology Tutorials
6h 9m26 lessonsBeginner1.7M views
Free
Ultrasound physics course
This is a basic ultrasound physics course designed for radiologists and radiographers looking to study for ultrasound physics or radiology physics exams.
by Radiology Tutorials
6h 9m26 lessonsBeginner1.7M views
Free
Essence of linear algebra
A free course offering the core concept of linear algebra with a visuals-first approach.
by 3Blue1Brown
3h 1m16 lessonsBeginner67M views
Free
Physics
In 46 episodes, Dr. Shini Somara will help you find your place in the world -- literally! -- with physics. This course is based on introductory college-level material and the 2016 AP Physics I and II curriculum. By the end of this course, you will be able to: *Identify the fundamental forces descri
by CrashCourse
7h 29m47 lessonsBeginner71M views
Free
Fundamentals of Physics with Ramamurti Shankar
This course provides a thorough introduction to the principles and methods of physics for students who have good preparation in physics and mathematics. Emphasis is placed on problem solving and quantitative reasoning. This course covers Newtonian mechanics, special relativity, gravitation, thermody
by YaleCourses
28h 45m24 lessonsBeginner9.2M views
Free
Fundamentals of Physics II with Ramamurti Shankar
This is a continuation of the introductory course on the principles and methods of physics for students who have good preparation in physics and mathematics. This course covers electricity, magnetism, optics and quantum mechanics. For more information about Professor Shankar's book based on the lec
by YaleCourses
29h 49m25 lessonsBeginner7.8M views
Free
Essence of calculus
A free course offering the core concept of Calculus, with a visuals-first approach aimed at making you feel like you could have discovered the subject yourself.
by 3Blue1Brown
3h 11m12 lessonsBeginner47M views
Free
MIT 7.016 Introductory Biology, Fall 2018
Instructors: Barbara Imperiali, Adam Martin, Diviya Ray View the complete course: https://ocw.mit.edu/7-016F18 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP63LmSVIVzy584-ZbjbJ-Y63 7.016 Introductory Biology provides an introduction to fundamental principles of biochemistry, mo
by MIT OpenCourseWare
27h 52m35 lessonsBeginner3.6M views
Free
Differential Equations
After learning calculus and linear algebra, it's time for differential equations! This is one of the most important topics in mathematics, especially for those who are interested in physics and engineering, as these equations show up anywhere that rates of change are described. Learn about different
by Professor Dave Explains
4h 8m27 lessonsBeginner1.2M views
Free
7th Grade, Unit 1, Illustrative Mathematics Tutorials Playlist
7th Grade, Unit 1, Open Up Resources - Illustrative Mathematics Tutorials Playlist. Search #711math #712math #713math to find individual tutorials fast!
by Illustrative Tutor
2h 46m13 lessonsBeginner464K views
Free
Inorganic/Organometallic Chemistry
So far we've learned a lot about general chemistry and organic chemistry, so let's move into inorganic chemistry and organometallic chemistry. In this series we will investigate all the elements on the periodic table that were ignored in organic chemistry, especially the transition metals. These ele
by Professor Dave Explains
5h 56m41 lessonsBeginner2.1M views
Free
Неорганическая химия
В этом плейлисте собраны уроки, в которых мы будем рассматривать самые важные неорганические вещества по такому плану: - нахождение в природе - физические свойства - методы получения - химические свойства
by Птичка Химичка -Химия с Нуля-
3h 16m12 lessonsBeginner712K views
Free
Geology Extra Curricular
Want to dive deeper into the topics covered in Crash Course Geology? Then this playlist is for you. Learn more about rocks, rivers, and renewable energy, plus what you need to know about climate change, natural disasters, and more.
by CrashCourse
10h 37m48 lessonsBeginner49M views
Free
Calculus 3 (Full Length Videos)
Calculus of Vectors, Vector Functions, Surfaces, and Vector Fields. Topics include an Introduction and study of vectors in 2-D and 3-D, a study of 3-D functions and surfaces, vector functions and calculus of vector functions, partial derivatives and multiple integrals using several coordinate syste
by Professor Leonard
75h 24m34 lessonsBeginner20M views
Free
Geology Crash Course
Welcome to Crash Course Geology! Over the course of 25 episodes, Sage will introduce you to the incredible geological forces, cycles, and processes that shape our world. This series will explore how geology touches all of our lives — and connects us to a much bigger story. Course Description In 25
by Dixon, D
3h 8m19 lessonsBeginner1.2M views
Free
IMAT 101 | Biology
All videos correspond to the IMAT Specifications
by Med School EU
19h 22m57 lessonsBeginner643K views
FreeThe author has removed some lessons
Prealgebra (Full Length Videos)
Topics: Introduction to the number line, Operations involving integers, Solving basic equations, Introduction to fractions, Introduction to rates and ratios, Operations with polynomials.
by Professor Leonard
38h 55m44 lessonsBeginner1.9M views
Free
General Physics I - PHYS 101
Standards and units; vectors and coordinate systems; kinematics; dynamics; work, energy and power; conservation of energy; dynamics of system of particles; collisions; rotational kinematics and dynamics; oscillations.
by Bilkent Üniversitesi
27h 13m39 lessonsBeginner799K views
Free
Freshman Organic Chemistry with J. Michael McBride
This is the first semester in a two-semester introductory course focused on current theories of structure and mechanism in organic chemistry, their historical development, and their basis in experimental observation. The course is open to freshmen with excellent preparation in chemistry and physics,
by YaleCourses
30h 5m37 lessonsBeginner975K views
Free
Gr. 10 Chemistry
A day-by-day lesson of topics covered in SNC2D (Gr. 10 Academic Science). Worksheets and homework solutions are linked below. PowerPoints & CoursePack with Answer Keys: (log out of gapps account if it asks for permission) Patreon: (Do not click if you are a current student)
by Science'n'me
2h 53m14 lessonsBeginner184K views
Free
Cell Biology Full Course | 13 High-Yield Chapters
🎓 Welcome to the Complete Cell Biology Lecture Series by MedicoMedics! In this full-length, 2.5+ hour course, we break down cell biology into 13 crystal-clear chapters — perfect for medical students, premeds, nursing students, biology majors, and anyone preparing for USMLE, NCLEX, PLAB, or related
by MedicoMedics
2h 32mBeginner18K views
Free
Algebra Introduction - Basic Overview - Online Crash Course Review Video Tutorial Lessons
This math video tutorial provides a basic overview of concepts covered in a typical high school algebra 1 & 2 course or a college algebra course. This video contains plenty of lessons, notes, examples, and practice problems for you to get a good foundation in algebra. Subscribe:
by The Organic Chemistry Tutor
1h 18mBeginner5.3M views
Free
HKDSE Chemistry Chapter 5 Atomic Structure 原子結構
原子的結構是怎樣的呢？它們是由什麽造成的？ What is the structure of atoms? What are they made of?
by 萌芽教室 Sprouting Classroom
1h 46m8 lessonsBeginner37K views
Free
HKDSE Biology Chapter 4 Movement of substances across the cell membrane 物質穿越細胞膜的活動
什麽是細胞膜？物質如何穿透它呢？ What is a cell membrane? How do substances pass through it?
by 萌芽教室 Sprouting Classroom
2h 12m9 lessonsBeginner18K views
Free
HKDSE Chemistry Chapter 7 Chemical Bonding: Ionic Bonding and Metallic Bonding 離子鍵及金屬鍵
什麽是離子鍵及金屬鍵？它們是怎樣組成的？有什麽特性？ What are ionic bonds and metallic bonds? How do they form? Any properties?
by 萌芽教室 Sprouting Classroom
1h 30m7 lessonsBeginner21K views
Free
Linear Algebra (Full Course)
A one semester, introductory course in Linear Algebra. Emphasizes both conceptual understanding and procedural fluency in applying the techniques of Linear Algebra. Major topics are solving linear systems, linear transformations, linear independence, bases, dimension, eigenvalues and eigenvectors, d
by Dr. Trefor Bazett
10h 50m84 lessonsBeginner5.6M views
Free
Foundations of Chemistry 基礎化學
這個課題是化學的基礎知識，熟讀並打穩根基，有助學生在化學世界中探索。 Here comes the basic knowledge of chemistry. Being familiar with the content makes it easier for you to understand the challenging topics ahead.
by 萌芽教室 Sprouting Classroom
7h 22m34 lessonsBeginner75K views
Free
HKDSE Biology Chapter 2 Molecules of life 生命分子
生命是由什麽分子構成呢？ What are the building blocks of life?
by 萌芽教室 Sprouting Classroom
2h 4m8 lessonsBeginner15K views
Free
HKDSE Biology Chapter 3 Cellular organisation 細胞組織
我們如何觀察細胞？細胞内有什麽？ How do we observe cells? What are inside a cell?
by 萌芽教室 Sprouting Classroom
1h 56m8 lessonsBeginner14K views
Free
HKDSE Biology Chapter 5 Metabolism and enzymes 酶與新陳代謝
什麽是酶？它們爲何那麽重要？ What are enzymes? Why are they crucial?
by 萌芽教室 Sprouting Classroom
1h 20m6 lessonsBeginner10K views
Free
HKDSE Biology Enrichment 生物科增潤内容
增潤内容。 Enrichment lessons.
by 萌芽教室 Sprouting Classroom
1h 53m11 lessonsBeginner11K views
Free
AP Physics 2
Review Material for the AP Physics 2 Exam in May. Additional Review can be found at:
by Science'n'me
1h 35m7 lessonsBeginner1.9K views
Free
HKDSE Physics Chapter 6 Kinematics 運動學
運動學研究物件之運動，並以數式連繫不同量。 Kinematics is the study of the motion of objects. We attempt to link quantities with mathematical equations.
by 萌芽教室 Sprouting Classroom
1h 10m4 lessonsBeginner2.4K views
Free
HKDSE Physics Topic 2 Basic mechanics 基礎力學
我們會探究重要數式來研究物件的運動，並探索牛頓提出的三大定律。 We will look into fundamental mathematical equations that describe the motion of objects, and explore the three Newton's Laws.
by 萌芽教室 Sprouting Classroom
2h 35m9 lessonsBeginner3.9K views
Free
WBP/KP GS (BIOLOGY)🔥
✅elit app : https://play.google.com/store/apps/details?id=in.elitacademy 👉WBP/KP Selection Batch 2026 WhatsApp Group- এ Join করো: https://chat.whatsapp.com/EdFn9i8oqYhFTm9hYzxJi1 👉WBP এবং KP পরীক্ষার সেরা প্রস্তুতির জন্য এটাই তোমার সেরা সুযোগ। 🔥WBP / KP / Police Exam 2026 📌 West Bengal Police
by elit
3h 3m4 lessonsBeginner1.1K views
Free
Biology
The following topics are covered 1.4 Ethical issues in biology 1.4.1 Ethical treatment of plants and animals during biological studies Unit one summary
by Fidel Tutorial
5h 35m13 lessonsBeginner932 views
Free
Yale Quantum Institute Course on Quantum Error Correction
This video is the live capture of the Yale Quantum Institute Course on Quantum Error Correction, held at the Yale University in July 2025, in partnership with NC A&T. This short course will provide viewers strong foundation on Quantum Error Detection & Quantum Error Correction. Viewers are encoura
by YaleCourses
11h 38m7 lessonsBeginner12K views
Free
有機化學(全) A Crash Course of Organic Chemistry
有機化學銜接課程 利用每個單元5-8分鐘的時間，幫您銜接高中端與大學端的有機化學課程，帶領各位領悟有機奧秘。 Ch0. Orbitals & Resonance & Functional Groups Ch1. Structures & Conformations Ch2. Stereochemistry : Enantiomers v.s. Diastereomers Ch3. Substitution Reactions (SN1 v.s. SN2) Ch4. Elimination Reactions (E1 v.s. E2) Ch5. Alkenes and Alkynes Ch6
by 威克漢化學 Wickhan Chemistry
9h 30m88 lessonsBeginner253K views
Free
Box2D Physics
All of the Box2D with Processing (Java) tutorial videos.
by The Coding Train
2h 12m12 lessonsBeginner371K views
Free
Important skills for Biology 生物科的重要技巧
重要技巧以待不時之需。 Some handy skills at your disposal.
by 萌芽教室 Sprouting Classroom
58m5 lessonsBeginner4.5K views
Free
HKDSE Chemistry Chapter 6 The Periodic Table 元素週期表
什麽是元素週期表呢？它沒有一些規律？ What is the periodic table? Are there any patterns?
by 萌芽教室 Sprouting Classroom
44m4 lessonsBeginner3.6K views
Free
HKDSE Chemistry Chapter 11 Occurrence and Extraction of Metals 金屬的存在與提取
金屬是如何提取呢？有哪五種常用方法呢？ How do we extract metals? What are the five common methods?
by 萌芽教室 Sprouting Classroom
58m5 lessonsBeginner2.7K views
Free
Calculus IV: Vector Calculus (Line Integrals, Surface Integrals, Vector Fields, Greens' Thm, Divergence Thm, Stokes Thm, etc) **Full Course**
This playlist on vector calculus covers approximately six weeks of my Calculus IV course. It follows my full semester multivariable calculus course here: https://www.youtube.com/playlist?list=PLHXZ9OQGMqxc_CvEy7xBKRQr6I214QJcd The major topics are line integrals, surface integrals, vector fields,
by Dr. Trefor Bazett
5h 28m39 lessonsBeginner5.9M views
Free
Arximed qüvvəsi (mövzu izahı). #fizika #dərslər #hazırlıq #physics
by Fizika Evi
47mBeginner762 views
Free
Biology 124: Cytology
Paul Andersen takes you on a tour of the cell. He starts by explaining the difference between prokaryotic and eukaryotic cells. He also explains why cells are small but not infinitely small. He also explains how the organelles work together in a similar fashion. Do you speak another language? H
by Melissa Vorster
1h 49m12 lessonsBeginner55M views
Free
Mathematics Lessons for JAMB, WAEC, NECO, NABTEB, SS1, SS2 and SS3 students
Join the full class at: https://myschool.ng/classroom/topic-videos?subject=mathematics Get in-depth, detailed topic by topic video lessons on Mathematics, specially designed for candidates preparing for exams such as JAMB, WAEC, NECO and NABTEB candidates. These video lessons attempt to cover all s
by Myschool
2h 25m11 lessonsBeginner420K views
Free