This bizarre mechanical computer has no wires or chips. It has no wires, no silicon chips, and needs zero electricity. Yet, ...

A steel bar pivots. A spring stretches. Then, with a small shove, the whole setup flips into a new state and stays there until the next push. That simple motion sits at the heart of a mechanical ...

Filling a test tube with molecules made from folded DNA can work as a simple computer. The approach has been used to split two numbers into prime factors. Conventional computers work by passing ...