Major climate events have opened up land bridges during prehistory, along which animals and humans traveled to new continents. A new study proposes that major weather events, like El Niño, open up “water bridges” that allow bacteria to do the same.
An outbreak of cholera in Haiti that began in 2010 is still killing people. Why have attempts to get it under control failed?
Cholera has long been a known disease, but it wasn't until the 1700s that it was recognized as a worldwide plague. It became one of the most feared diseases in the world because it adapted to humans enough to take control of our basic bodily functions.