Anatomy
See how things really work.
Good fun learning. Every explainer here is a real thing you can click, fire, slide and play with. Free, no sign-up.
5 to play withPhysicsHistorySports
PhysicsThe double-slit experiment
Fire electrons one at a time and watch stripes appear.
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PhysicsStern–Gerlach bench
Split silver atoms with magnets you can turn and block.
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PhysicsClocks that disagree
Fly a ship near light speed and watch its clock slow.
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HistoryInside the Great Pyramid
Cut open a to-scale pyramid and visit every room.
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SportsAmerican football
Learn the whole game in pictures, then run a drive.
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The galaxy
Fly out from Earth and see where we sit.
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Next explainer
Something new to take apart is on the way.