Electronic skin

Tiny, nearly invisible devices stick to skin, ‘talk’ to computers

Shuffling shenanigans

A magician-turned-mathematician figures out how many times to shuffle a deck of cards before playing Old Maid

Tracing a gem’s origins

Lasers identify the country — and even a mine — that a precious stone hails from

Cars of the future

New cars will be smarter, safer, more efficient — and able to drive themselves.