One 75-watt bulb gives more light than three 25-watt bulbs.
57
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
One barrel of petroleum holds 42 gallons.
20
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
Sound travels about 4 times faster in water than in air.
408
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17