Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
There was once an undersea post office in the Bahamas.
241
The Caspian Sea is also classed as the world's largest lake.
52
Water is actually naturally blue.
48
The Titanic is about as long as the Empire State building is tall.
174
NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119