Top 10 Best Accidental Scientific Discoveries and Inventions

Viagra (Sildenafil)

The well known medication, Viagra, to treat erectile dysfunction, as well as other ailments, was accidentally discovered by pharmaceutical chemists working for Pfizer. Originally a medicine to treat hypertension and angina, clinical trials showed patients were experiencing increased erections and no changes to hypertension or angina.


In 1895, German physicist Wilhelm Roentgen, discovered x-rays existence while using a cathode ray tube, taking note of the fluorescent effect on a cardboard screen that was painted with barium plantinocyanide. After experimenting, he took the first ever x-rays of his wife’s hand, and was able to see her bones.