The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
It's still possible to see the division between East and West Germany due to different light bulbs.
5
The average ice berg weighs 20,000,000 tons!
54
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Forest fires move faster uphill than downhill.
52