Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
In 1850, only 8% of the people in California were women.
0
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The Sahara desert expands at about 1km per month.
90
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55