accidental inventions

Contrary to popular believe, Velcro wasn't invented by NASA, but in 1941 by a Swiss engineer who noticed how cockle burrs stuck to his dog's fur.  Did you know that Viagra was invented as a drug to treat Angina...but they found an even more profitable side effect...

They say necessity is the mother of invention, but sometimes its not necessity but an accident that brings us some of the greatest inventions of all time.  Check out these happy accidents that changed our lives.

Not all accidents are a bad thing.  Sometimes accidents turn into gold mines. So, from dynamite to Penicillin these are the top 25 accidental inventions that changed the world.