Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Scientists aren't sure what color dinosaurs were.
312
A ball of glass will bounce higher than a ball made of rubber.
73
Pure water (H2O) does not conduct electricity on its own.
46
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
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
Sound travels about 4 times faster in water than in air.
408