Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Most dust particles in your house come from dead skin.
48
Hot water can freeze faster than cold water.
181
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Cold water weighs more than hot water.
93