Whale oil was used in automobile transmissions as late as 1973.
56
There's a Mumbai-based pizzeria that now delivers pizza by drone.
4
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
A toaster uses almost half as much energy as a full-sized oven.
33
Sony researchers have developed a refrigerator that only opens when you smile.
9
The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
60


