Kleenex tissues were originally used as filters in gas masks.
46
To have your picture taken by the very first camera you would have had to sit still for 8 hours!
308
There's a Mumbai-based pizzeria that now delivers pizza by drone.
4
The first alarm clock could only ring at 4 a.m.
120
Windmills always turn anti-clockwise. Except for the windmills in Ireland!
184
The average car produces a pound of pollution every 25 miles!
18
Jumbo jets use 4,000 gallons of fuel to take off.
19