Energy is being wasted if a toaster is left plugged in after use.
21
Whale oil was used in automobile transmissions as late as 1973.
56
Henry Ford produced the model T only in black because the black paint available at the time was the fastest to dry.
33
There are only 14 blimps in the world.
69
The first alarm clock could only ring at 4 a.m.
120
A small airplane can fly backwards.
75
The cigarette lighter was invented before the match.
210
