Cold water weighs more than hot water.
93
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Sound travels fifteen times faster through steel than through air.
134
Sound travels about 4 times faster in water than in air.
408
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
4.5 pounds of sunlight strike the Earth each day.
27
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21