In 1850, only 8% of the people in California were women.
0
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
Australia's Great Barrier Reef is 1,250 miles long!
45
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55