Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The only letter not appearing on the Periodic Table is the letter "J".
180
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Cold water weighs more than hot water.
93