Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Nylon is made from coal and petroleum.
42
Balsa wood is classified as a hard wood!
41