Nearly 50% of the world's scientists are assigned to military projects.
71
Iron weighs more after it rusts.
16
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Sound at the right vibration can bore holes through a solid object.
134
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Hot water can freeze faster than cold water.
181
Scientists are now able to grow 'beating' heart tissue in a lab!
162
Sound travels fifteen times faster through steel than through air.
134