The first alarm clock could only ring at 4 a.m.
120
It would take twenty new mid-size cars to generate the same amount of pollution that a mid-size 1960's car did.
20
The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
60
To have your picture taken by the very first camera you would have had to sit still for 8 hours!
308
Windmills always turn anti-clockwise. Except for the windmills in Ireland!
184
There are only 14 blimps in the world.
69
