Learn Science
Whatever Your Age
35 premier, world-class websites covering Biology, Chemistry, and Physics — curated for learners ages 6 to 60, from basics to university level.
Young Explorers
Ages 6–10 · Grades K–4 · Fun, visual, and hands-on introductions to science
Games, videos, and resources teaching younger students about animals, nature, space, and the environment. Combines education with entertainment through engaging articles and interactive games. Ideal for ages 6+.
Visit Site ↗Hundreds of child-friendly science videos exploring questions like "Why?" across topics including humans, animals, and the environment. Engaging hosts make complex ideas accessible and fun for early learners.
Visit Site ↗Fun science experiments, facts, and games that ignite a passion for science. Features hands-on experiments kids can conduct at home with everyday materials, encouraging observation and curiosity.
Visit Site ↗Educational games, videos, and activities featuring beloved characters like Curious George and Wild Kratts. Introduces children to critical concepts in science and nature. Parents can manage screen time and content visibility.
Visit Site ↗Animated videos on science topics accompanied by quizzes and games to reinforce learning. The animation and humor keep kids entertained while mastering difficult concepts. Designed for grades K–3.
Visit Site ↗Created by science teacher Bob Pflugfelder, this site offers video tutorials for science experiments and science fair project ideas. Completely free, with a focus on making science exciting for young learners (ages 7–14).
Visit Site ↗A treasure trove of science experiments, activities, and fun facts. Emphasizes hands-on learning using simple, everyday materials — perfect for kids who love building, experimenting, and getting creative with science.
Visit Site ↗Middle School Builders
Ages 10–14 · Grades 5–8 · Building foundations in all three core sciences
One of the world's foremost free learning platforms, with over 10,000 video lessons from basic concepts to advanced science. Features practice exercises, quizzes, and personalized progress tracking. Covers middle school through AP/college level.
Visit Site ↗Free adaptive textbooks, simulations, videos, and standards-aligned lessons. Covers earth, life, and physical sciences at middle and high school level. Content adapts to the learner's pace. Used in classrooms worldwide.
Visit Site ↗Interactive science activities with lessons ranging from physics and human biology to ecology. Organized by grade level for grades 3–8. Makes science accessible through engaging animated presentations and self-check quizzes.
Visit Site ↗STEM project ideas, articles, videos, and activities across all sciences — from physics and robotics to cosmetic chemistry and human behavior. Excellent for science fair preparation and independent exploration. Grades K–12.
Visit Site ↗Bill Nye's official site with video clips from his iconic TV show. Covers space, the human body, and physics. His unique approach using humor and fun experiments makes learning engaging for students ages 8–14.
Visit Site ↗Online extension of San Francisco's famous science museum. Features interactive exhibits, virtual experiments, and educational videos covering a broad range of science topics. Inquiry-based — ideal for students who love to explore.
Visit Site ↗Uses illustrations, charts, and graphs to explain everything from nuclear fission to how ice cubes melt. Connects scientific concepts to real-world engineering applications. Best suited for ages 12 and up.
Visit Site ↗High School & AP Level
Ages 14–18 · Grades 9–12 · Rigorous, curriculum-aligned science
World-renowned free interactive simulations from the University of Colorado Boulder. Visualize scientific topics, change parameters, make measurements. Covers mechanics, waves, electricity, quantum phenomena, chemical reactions, and more.
Visit Site ↗With 15+ million subscribers, Crash Course creates instructional videos using humor and education. Covers complete series in biology, chemistry, physics, and astronomy. Fast-paced and thorough — a favorite for exam review.
Visit Site ↗Comprehensive standards-aligned tutorials covering all major physics topics: kinematics, Newton's laws, momentum, waves, sound, light, circuits, and magnetism. Concept builders, tutorials, and practice problems — all free.
Visit Site ↗Award-winning AP-aligned science videos by an expert teacher. Covers AP Biology, AP Chemistry, AP Physics, and AP Environmental Science. AP exam-specific problem solving and free-response strategies included.
Visit Site ↗Teacher-created resource with labs, investigations, pacing guides, and lessons for Biology, Pre-AP Biology, and AP Biology. Covers cell biology, genetics, evolution, ecology, and human body systems in depth.
Visit Site ↗Virtual chemistry labs and scenario-based activities from Carnegie Mellon University. Features "murder mystery" forensics investigations using chemical analysis. Develops quantitative analytical skills at the high school and introductory college level.
Visit Site ↗Produced by the Howard Hughes Medical Institute. Free films, 3D interactives, virtual labs, and activities on evolution, genetics, ecology, cell biology, and neuroscience. Trusted by educators worldwide for rigorous, research-based content.
Visit Site ↗Interactive problem-solving courses with guided hints — builds intuition before formalism. Covers classical mechanics, electricity & magnetism, waves, thermodynamics, quantum mechanics, chemistry fundamentals, and math. Ages 10–adult.
Visit Site ↗University & Adult Learners
Ages 18–60+ · University to professional/graduate level
Since 2001, MIT has published free materials from 2,400+ courses — lecture notes, video lectures, assignments, and exams. Biology, Chemistry, Physics from introductory through quantum mechanics, statistical mechanics, astrophysics, and beyond.
Visit Site ↗Partners with Stanford, Harvard, Yale, and 200+ universities. Structured science courses with graded assignments and verified certificates. Many courses free to audit. Covers molecular biology, biochemistry, astrophysics, quantum mechanics, and more.
Visit Site ↗Co-founded by Harvard and MIT. University-level courses from Harvard, Berkeley, Oxford, and others. Free access to most materials; master's degrees and professional certificates also available for advanced learners.
Visit Site ↗Nearly 400 peer-reviewed, open-access textbooks — completely free. Includes university- level Biology 2e, Chemistry 2e, University Physics Vol. 1–3, Anatomy & Physiology, and more. Written by expert authors, reviewed by educators.
Visit Site ↗Stunning animated video lessons across all science topics — from viral replication and CRISPR to black holes and quantum weirdness. Each lesson includes discussion questions and additional resources. Ages 13–adult.
Visit Site ↗Journalist-quality science articles covering current discoveries. SNexplores targets ages 9–14; ScienceNews targets adults with rigorous reporting across all science fields. Bridges classroom learning with real-world scientific discovery.
Visit SNexplores ↗Powerful computational knowledge engine that solves chemistry equations, physics problems, and math expressions step by step. Invaluable for advanced students and adult learners checking their work or exploring computations.
Visit Site ↗In-depth university-level video series on organic chemistry, biochemistry, physics, and more. Known for clear explanations rivaling university lectures. Completely free and spans foundational to advanced content across all three core sciences.
Visit Site ↗All Ages & Cross-Tier
Ages 6–60+ · Span multiple levels and disciplines — great for any learner
The definitive resource for space and Earth science. Kid-friendly explainers to full research publications. Interactive tools, live mission updates, image galleries, and educational resources for every age from 6 to 60+.
Visit Site ↗World-class science journalism, stunning photography, documentaries, and interactive features covering biology, ecology, climate, and natural history. Bridges entertainment and rigorous science for teens through adults.
Visit Site ↗Award-winning biology channel with clear, humorous videos covering genetics, cell biology, evolution, ecology, and more. Beloved by middle school, high school, and college students alike. Makes challenging biology memorable and approachable.
Visit Site ↗Authoritative resource for weather, ocean, and climate science. Explore coral reefs, satellites, and atmospheric phenomena. Useful for science investigations and understanding Earth systems from middle school through adult levels.
Visit Site ↗Virtual laboratory simulations for conducting safe digital experiments in biology, chemistry, and physics. Covers DNA extraction, PCR, titrations, optics, circuits, and more. Widely used at high school and university level. Institutional access common.
Visit Site ↗Recommended Learning Pathways
Choose the pathway that matches your age, goals, and subject focus.
- SciShow Kids · PBS Kids · Nat Geo Kids (Ages 6–9)
- Science Bob · Science Kids · Funology (Ages 9–12)
- Khan Academy MS + StudyJams + CK-12 (Ages 10–14)
- Crash Course + Biology Corner + Amoeba Sisters (Biology)
- CK-12 + Crash Course Chemistry + ChemCollective (Chemistry)
- Physics Classroom + PhET + Crash Course Physics (Physics)
- Bozeman Science AP + HHMI BioInteractive (AP Level)
- Khan Academy (fill gaps in algebra / pre-calculus)
- Crash Course Bio + Chemistry + Physics (rapid overview)
- OpenStax textbooks (free, structured reading)
- Professor Dave Explains (in-depth, topic by topic)
- Coursera or edX (university-level structured courses)
- MIT OpenCourseWare (deep dive, exam-level rigor)
- Labster (lab skills) + Wolfram Alpha (computation)
- TED-Ed (bite-sized, conceptual wonder)
- National Geographic + NASA (real science, any age)
- Science News / SNexplores (current discoveries)
- HowStuffWorks (real-world connections)
- Khan Academy → Brilliant.org (structured depth)
- MIT OpenCourseWare (university level when ready)
- National Geo Kids → Amoeba Sisters
- Biology Corner → HHMI BioInteractive
- Khan Academy AP Biology
- Coursera / edX Life Sciences
- MIT OCW Biology (undergraduate → graduate)
- Science Bob (experiments) → CK-12 Chemistry
- Crash Course Chemistry
- ChemCollective (virtual labs)
- Professor Dave: Gen Chem → Organic Chemistry
- Bozeman AP Chemistry → OpenStax Chemistry 2e
- MIT OCW Chemistry (undergraduate → graduate)
- Science Kids (forces) → PhET Simulations
- Bill Nye → Brilliant.org
- Physics Classroom → Crash Course Physics
- Bozeman AP Physics
- OpenStax University Physics Vol. 1–3
- MIT OCW Physics (through quantum mechanics)
Math Prerequisites by Tier
- Basic arithmetic (counting, measuring)
- No algebra required
- No prior science needed
- Pre-algebra: fractions, ratios, percentages
- Biology: arithmetic sufficient
- Physical science: basic formula substitution
- Algebra I (ratios, simple equations)
- Genetics ratios, population ecology
- Sequence: MS Life Science → HS Biology
- Algebra I–II (logarithms essential)
- Stoichiometry, molarity, pH, equilibrium
- Sequence: Biology → HS Chem → AP Chem
- Algebra II + Trigonometry (essential)
- Kinematics vectors, force diagrams, circuits
- AP Physics C: Calculus I concurrent
- Biology: Calculus I helpful; statistics
- Chemistry: Calculus I–II; Linear Algebra
- Physics: Calculus I–III + Differential Equations