The first alarm clock could only ring at 4 a.m.
120
Car airbags kill 1 person for every 22 lives that they save.
80
The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
60
More than a billion transistors are manufactured every second.
-25
Surgeons who grew up playing video games make 37 percent fewer mistakes.
250
Kleenex tissues were originally used as filters in gas masks.
46
