A version of this story appears in the September 2020 issue of National Geographic magazine. Philadelphia detected its first case of a deadly, fast-spreading strain of influenza on September 17, 1918.

"Die With a Smile" is the latest leader, dating to the Hot 100's 1958 launch. By Xander Zellner Billboard has been publishing weekly rankings in one form or another for more than a century. Early in ...

We developed a thin, flexible microelectrode array that can be slid through a small slit in the skull onto the brain surface. We showed that this minimally invasive system records and stimulates ...