Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Iron weighs more after it rusts.
68
At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
15
The only letter not appearing on the Periodic Table is the letter "J".
180
Hot water can freeze faster than cold water.
181
4.5 pounds of sunlight strike the Earth each day.
27
Nylon is made from coal and petroleum.
42
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39