Based on tests of microbes under Marslike conditions, an expert thinks airborne microbes could grow 30 miles above Earth's surface, in the stratopause.
Pesky parasites can tell their own version of our history, including the idea that modern humans intermingled with Neanderthals and that humans may have first put on clothing before leaving Africa.
The strain of cholera bacteria that became epidemic in Haiti in 2010 is now infecting and killing people in other countries as well.
Projections for rising sea levels are expected to increase in the new IPCC report on the state of climate change science.
Researchers have relied on cells called HeLa cells for years, but the cells were collected without the consent of the woman they came from, Henrietta Lacks, which has made their use controversial.
Madagascar, one of the most biodiverse places on Earth, has seen a decline in the rate of formation of new species over time, a new study of DNA of its unique lizards shows.