The presence of water on Mars is often talked about in the past tense -- as in, billions of years in the past. But researchers have found clues that water could be flowing in the present, at least during warm seasons.
Ken Fager now calls himself an "urban explorer," but years ago he was just a study-abroad student who missed his train in Butzbach, Germany, and decided to spend the next few hours walking through an abandoned factory by the station.<
Most people are carrying around historical records in their DNA, with clues to how people from genetically distinct groups intermingled over the last 4,000 years. That's the conclusion of a new study in the journal Science.