To track the spread of a virus, sometimes doctors keep careful data about each case of the virus that is discovered. But how easy is it to track the progress of a virus? Do this activity and see ...

LONDON Several teams of scientists around the world have, for some time, been studying the possibility that a genetic mutation perpetuated by the organism responsible for bubonic plague, or the Black ...

Poet John Donne wrote these lines in his "Meditation XVII" as the feared Black Death ravaged his native London in 1624. The plague seems like a disease of a distant century, conjuring up the rat ...