The first alarm clock could only ring at 4 a.m.
120
There's a Mumbai-based pizzeria that now delivers pizza by drone.
4
More than a billion transistors are manufactured every second.
-25
Originally, Nintendo was a playing card manufacturer.
70
Whale oil was used in automobile transmissions as late as 1973.
56
More steel in the United States is used to make bottle caps than to manufacture automobile bodies.
55
The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
60