An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Australia's Great Barrier Reef is 1,250 miles long!
45
More than 25% of the world's forests are in Siberia.
51
It's still possible to see the division between East and West Germany due to different light bulbs.
5
The Sahara desert expands at about 1km per month.
90
The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
1
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Israel's Dead Sea is 1,312 feet below sea level.
48