10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
It's still possible to see the division between East and West Germany due to different light bulbs.
5
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
Forest growth in the US has exceeded harvest since the 1940’s. Today, we have more trees than any time in the past 100 years.
14
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Every year, Alaska has about 5,000 earthquakes.
31
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48