K. Birgitta Whaley

According to Einstein's theory, Earth's rotation drags space-time itself along — like a spoon dragging thick honey. This effect is incredibly weak: about one revolution in billions of years. But it can be caught.

The light from a single molecule is like a lone voice in a vast choir. To hear it, you need not a microphone but a delicate instrument that catches each photon and notes its arrival time.