Hands-on experiments with the ideas that broke common sense. Run them yourself, change the settings, and see the result no intuition predicts.
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Light and matter behaving in ways nothing in daily life prepares you for.
Fire photons one at a time and watch stripes appear that only a wave could draw. Then peek at which slit they took.
Run the experiment →Measure linked photon pairs at angles you choose, then run the Bell test that rules out Einstein's hidden instructions.
Run the experiment →Send a wave packet at a barrier it can't climb and watch part of it appear on the other side.
Run the experiment →Tag which slit each photon took, erase the tag later, and see the stripes reappear only when you sort the hits.
Run the experiment →Watch a quantum superposition fade into an ordinary either-or as its surroundings learn which way it went.
Run the experiment →Send silver atoms through a chain of magnets and see spin come in two values, and measurements undo each other.
Run the experiment →Clocks that disagree, space that bends and stretches, and the speed limit of the universe.
Fly to a nearby star near light speed and come home younger than the twin you left behind.
Run the experiment →Launch planets and light rays around a heavy mass and watch Einstein's orbits drift where Newton's close.
Run the experiment →Two black holes spiral together, stretching space as they go. Hear the chirp LIGO detected in 2015.
Run the experiment →Stretch a universe of galaxies and find that every one sees the rest rushing away, faster the farther they are.
Run the experiment →Race a light pulse to the Moon, Mars and the nearest star in real time, and talk to a Mars rover.
Run the experiment →Simple rules that produce flocks, epidemics, evolution and an arrow of time.
Start two pendulums a billionth of a radian apart and watch them part ways completely.
Run the experiment →Let gas spread through a box, then run time backwards and see why it almost never un-mixes.
Run the experiment →Hungry predators pick off the easiest-to-spot creatures, and the survivors' camouflage improves with no designer.
Run the experiment →Three rules make birds flock, and four make Conway's Game of Life grow gliders and machines.
Run the experiment →Watch an outbreak spread dot to dot, then vaccinate enough people that it fizzles out on its own.
Run the experiment →Probability and infinity, where the right answer feels wrong until you test it.
Pick a door, watch the host reveal a goat, and find out why switching wins two times out of three.
Run the experiment →Fit infinitely many new guests into a full hotel, then prove some infinities are bigger than others.
Run the experiment →With just 23 people in a room, two probably share a birthday. Fill the room and see why.
Run the experiment →Real-world numbers start with 1 about 30% of the time. See why, and test your own data.
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