Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Nearly 50% of the world's scientists are assigned to military projects.
71
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Sound travels fifteen times faster through steel than through air.
134
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38