Sound travels about 4 times faster in water than in air.
408
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Your brain is 80% water.
525
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
Out of all the senses, smell is most closely linked to memory.
146