Ebola is one of the nasty viruses that can hide in the body even after a patient recovers and tests negative. It can reemerge and trigger a new outbreak years later. How do they survive? And how can they be kayoed?

Argentina's libertarian president, Javier Milei, faces midterms amid economic chaos and a $20 billion lifeline offer from President Trump.

In 1812, hundreds of thousands of men in Napoleon's army perished during their retreat from Russia. Researchers now believe a couple of unexpected pathogens may have helped hasten the soldiers' demise.