Courses
Science
10 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
MIT 18.642 Topics in…
by MIT OpenCourseWare
26h 12m · Intermediate
October 2025
Free22 lessons
Biology
by CrashCourse
10h 48m · Beginner
May 2023
Free51 lessons
MIT 18.200 Principles of…
by MIT OpenCourseWare
24h 42m · Intermediate
November 2025
Free20 lessons
All Science courses
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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
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
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
耶鲁大学开放课程：基础物理 Open Yale course：Fundamentals of Physics 01
by funny
1h 13mBeginner567 views
Free