10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
Australia's Great Barrier Reef is 1,250 miles long!
45
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56
Europe is the only continent without a desert.
62