Oxygen is the most abundant element in the Earth's crust, waters, and atmosphere (about 49.5%)
Amazing fact: Alexander Graham Bell
Alexander Graham Bell, who invented the telephone, also set a world water-speed record of over seventy miles an hour at the age of seventy two.
Amazing fact: Blood vessels
There are 62,000 miles of blood vessels in the human body laid end to end they would circle the earth 2.5 times
Amazing fact: South Africa and gold
South Africa produces two-thirds of the world's gold.
Amazing fact: Thomas Edison
Thomas Edison, light bulb inventor, was afraid of the dark.
Amazing fact: Space and ocean depth
Given their sheer volume, ninety-nine percent of the living space on the planet is found in the oceans. The average depth of the oceans is 2.5 miles (4 km). The deepest point lies in the Mariana Trench, 6.8 miles (10.9 km) down. By way of comparison, Mount Everest is only 5.5 miles (8.8 km) high.
Amazing fact: Moons of the solar system
All the moons of the Solar System are named after Greek and Roman mythology, except the moons of Uranus, which are named after Shakesperean charcters.
