Sound travels about 4 times faster in water than in air.
408
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Iron weighs more after it rusts.
68
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
One 75-watt bulb gives more light than three 25-watt bulbs.
57
One cubic foot of gold weighs more than 1,200 pounds!
78
Nearly 50% of the world's scientists are assigned to military projects.
71
A 'jiffy' is an actual unit of time for 1/100th of a second!
66