Sound travels about 4 times faster in water than in air.
408
Nearly 50% of the world's scientists are assigned to military projects.
71
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
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
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
A ball of glass will bounce higher than a ball made of rubber.
73
4.5 pounds of sunlight strike the Earth each day.
27