Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The average temperature at 40,000 feet above sea level is -60 F.
56
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Diamonds can be shattered with a hammer.
-104
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79