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GEOGRAPHY

Before compasses, Vikings navigated the ocean using birds, whales, celestial bodies, chants and rhymes.
A man called Harold Hackett has put over 4800 messages in bottles into the ocean and has gotten 3000 responses back.
It's okay to pee in the ocean since 95% of urine is water and the nitrogen in urea is used to feed ocean plants.
There's an ongoing decrease in the pH of the Earth's oceans: they are 30% more acidic than in 1751.
10,000 shipping containers are lost at sea each year and 10% of those hold toxic chemicals which may leak into the ocean.
The Bermuda Triangle has as many ship and plane disappearances as any other region of the ocean.
100% of the earth's ocean floor has been mapped to a maximum resolution of around 5km.
95% of the underwater world remains unexplored.
Oceans cover 71% of the Earth's surface.
There are over 3 million shipwrecks on the ocean floor according to the U.N.