The STEAM resources we point people to first — ranked, with the web address, what it offers, and why it matters. Free unless noted.
https://www.khanacademy.org
Free, structured courses across math, science, computing, and the arts — from early grades to AP and college level.
The single best free starting point for almost any STEAM subject. Mastery-based, well-sequenced, and trusted by teachers worldwide.
https://code.org
K–12 computer-science curriculum, plus the famous Hour of Code. Used in classrooms in every U.S. state and beyond.
If you want one path from “never coded” to real computer science, this is it. The block-based intro removes every excuse to not start.
https://phet.colorado.edu
Free interactive science and math simulations from the University of Colorado Boulder — physics, chemistry, biology, and math.
Let students play with a concept before you explain it. Drag a slider, watch the wave change — intuition first, equations second.
https://www.desmos.com
The best free graphing calculator on the web, plus classroom activities for teachers.
Graphing that feels like drawing. It turns abstract functions into something you can see and manipulate in seconds.
https://www.nasa.gov/learning-resources/
Space-themed lessons, real mission data, and citizen-science projects for every grade band.
Nothing motivates a young scientist like real spacecraft data. Free, official, and endlessly deep.
https://www.exploratorium.edu
Hands-on science activities and “Science Snacks” you can build from household materials.
The home of hands-on science learning. Every Snack is a tested, low-cost experiment with a clear explanation of the why.
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