Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Sound travels about 4 times faster in water than in air.
408
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Your brain is 80% water.
525
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Nylon is made from coal and petroleum.
42
One cubic foot of gold weighs more than 1,200 pounds!
78
Scientists are now able to grow 'beating' heart tissue in a lab!
162