Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
A ball of glass will bounce higher than a ball made of rubber.
73
Aluminum used to be more valuable than gold!
84
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Hot water can freeze faster than cold water.
181
Most liquid laundry detergents are alive with living organisms that help to break down stains!
88
Sound travels fifteen times faster through steel than through air.
134