4) Silly Putty
The next toy in our list was designed by James Wright, a General Electric engineer, in 1943.
But like other great things, it was created by accident during research into potential rubber substitutes for use in the USA in the WWII.
Creating a rubber substitute was a fail, but he has managed to create one of the most popular toys in history.
The toy is based on silicone polymers that have unusual physical properties.
It bounces, but breaks when given a sharp blow and can also flow like a liquid.
Silly Putty contains a viscoelastic liquid silicone, a type of non-Newtonian fluid, which makes it act as a viscous liquid over a long time period but as an elastic solid over a short time period.
With tens of millions of these little eggs sold every year for the last 50 years, the little accident that could has become one of the most popular toys ever.
