Climate scientist Gordon Hamilton died in Antarctica over the weekend when his snowmobile plunged into a deep glacial crevasse. His research in Antarctica and Greenland focused on the relationship between melting ice sheets and rising sea levels.
As summer ends, people are cramming in that much-needed vacation in increasing numbers. But not everyone is taking them, indeed a quarter of American workers get no paid time off. And that's a problem for our brains.
No one quite knows when humanity's direct ancestors — the Homo genus — first evolved, but a fossil discovered in Ethiopia in 2013 may provide clues. And according to new studies, those clues point back further into time than was previously thought.