The Sahara desert expands at about 1km per month.
90
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The average ice berg weighs 20,000,000 tons!
54