If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
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 Niagara Falls moves upstream at an average rate of about 295ft a century!
48
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Forest fires move faster uphill than downhill.
52