Add Yahoo as a preferred source to see more of our stories on Google. Brain waves emblematic of generalized epilepsy. Kateryna Kon/Science Photo Library via Getty Images Jena, Germany, 1924: Working ...

We preselected all newsletters you had before unsubscribing.

Giridhar Kalamangalam does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...