Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One barrel of petroleum holds 42 gallons.
20
4.5 pounds of sunlight strike the Earth each day.
27
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
Balsa wood is classified as a hard wood!
41