Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more.

Make science come alive with these free hands-on activities aligned to middle and high school standards.

Aug 14, 2025 · Free, high-quality science resources for grades 6–12, including hands-on activities, simulations, and teacher tools—all aligned to NGSS, TEKS, and AP standards.

Learn science using videos, articles, and TEKS-aligned practice exercises. Review the fundamentals of matter and energy, forces and motion, Earth's systems and processes, living …

Mar 4, 2025 · Our interactive activities are inspired by real-world biological phenomena. They’re designed to help students investigate, model, and analyze data while encouraging curiosity …

Learn fourth grade math—arithmetic, measurement, geometry, fractions, and more. This course is aligned with Common Core standards.

Many states initially resisted what they saw as federal overreach—but ultimately went along with the new regulations to avoid losing funding. President George W. Bush signs the No Child Left …

A little bit of research and reading, deeper than what you got here in this lesson, would be beneficial. You'd learn the information that you seek, and you would learn HOW to do …

Inspire early learning with Khan Academy Kids - a free educational app with thousands of games, books, and lessons that build core reading, math, and social-emotional skills.

This course is aligned to the middle school Next Generation Science Standards (NGSS). If you’ve mastered this content and want to explore physics at the next level, we recommend our high …