Castor oil is used as a lubricant in jet planes.
-5
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
The first alarm clock could only ring at 4 a.m.
120
Energy is being wasted if a toaster is left plugged in after use.
21
The cigarette lighter was invented before the match.
210
The life boat was patented in 1845!
29
There's an "anti-smartphone" called John's Phone which can only make and receive calls.
7