The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
A small airplane can fly backwards.
75
The first hard drive available for the Apple II had a capacity of only 5 megabytes.
46
Jumbo jets use 4,000 gallons of fuel to take off.
19
Scientists in China have built a prototype high-speed maglev train that is theoretically capable of reaching speeds of up to 1,800 mph (2,900 km/h).
1
Energy is being wasted if a toaster is left plugged in after use.
21
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12