A new study says our prehistoric ancestors dispersed across the globe in waves inspired by dramatic changes in the world’s climate.

ENVIRONMENT
A new study finds that conserved lands contributed around $1.8 billion to Vermont's tourism industry between 2007 and 2014.
A new bus model with longer range could make it easier for cities to switch to all-electric bus fleets.
And around colleges, they're filled with caffeine and nicotine to boot.
If he consumes like an average American, that means more than 4 pounds of trash per day. Things might get a little heavy.
Wilderness landscapes cease to be wilderness not when humans settle there (many indigenous peoples help preserve rather than erode wilderness), but when humans disturb ecosystems with land conversion, industrial activity, or large-scale infrastructure pro
Wild populations are rebounding, thanks in part to forest protection and reforestation measures.
Scientists aboard the ship will study how global warming is affecting Earth's oceans.
On November 1, 1755, an earthquake released the energy equivalent of 32,000 Hiroshima atomic bombs, with Lisbon suffering the worst of it. Then the tsunami hit...
Working fewer hours may be good for both our mental health and the health of the planet.
Yet another reason those long commutes aren't good for you.
Reaching the summit of Mount Everest has become a must-do ascent for pro climbers and amateur mountaineers, but ascending the world's highest peak is becoming more dangerous. Here's why.
Walruses take a break from hunting to chill out on beaches in massive groups, but scientists have a hard time figuring out why they choose the locations they do.
If our hero looks like Tom Cruise, it's no coincidence.
Researchers say the saltier water and sand could threaten coastal wildlife.
It's summer. Time to think about the science of the cubes clinking in your drink.
Taber MacCallum and Jane Poynter witnessed the most affecting solar eclipse of their lives in 1992. That's because as they watched the Sun disappear behind the Moon’s shadow, they were also watching their oxygen supplies slipping away.
The discovery could make oil spill clean-ups more efficient.
Scientists have found a simple way to get hydrogen out of fescue grass.