An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
A toaster uses almost half as much energy as a full-sized oven.
33
There's an "anti-smartphone" called John's Phone which can only make and receive calls.
7
The life boat was patented in 1845!
29
The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
60
Whale oil was used in automobile transmissions as late as 1973.
56
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41