An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
There are approximately three chickens for every human on Earth.
13
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61