If you were to dig deep below New York City’s streets, past the subway tunnels, you might expect to find thick layers of schist, gneiss and marble.

The time for the Moon to revolve around the Earth is about 27.3 days, while the Earth rotates once around its axis in 24 ...

Male Danionella cerebrum fish are only about the size of a fingernail, but can produce noises exceeding 140 decibels, ...