The story of the invention of batteries nicely illustrates how an unexpected observation can stimulate curious minds and lead to new inventions with world-changing results.
It begins in 1780 with Luigi Galvani dissecting a frog attached to a brass hook. When he touched the frog’s leg with an iron scalpel it twitched. Galvani’s friend, Alessandro Volta, thought that it might have something to do with a moist connector (the dead frog) joining two different metals. That led to further experiment…