A small airplane can fly backwards.
75
Scientists in the UK are creating a smartphone app that will enable users to test for STDs.
0
The first alarm clock could only ring at 4 a.m.
120
Originally, BMW was an airplane engine manufacturer.
69
The cigarette lighter was invented before the match.
210
The life boat was patented in 1845!
29
There are only 14 blimps in the world.
69