After seeing an exhibit of an old relay-based computer as a kid, [Simon] was inspired to build a simple two-relay latching circuit. Since then, he’s been fascinated by how relays can function… ...

Consistent effort transforms square root calculations into a strength. Learning to calculate square roots quickly can make a huge difference in your maths exams.

A test-tube circuit made of DNA-based logic gates can calculate the square root of numbers up to 15, using DNA replication and sequence binding to conduct computations. It's excruciatingly slow ...