Anthropologists believe early humans evolved in Africa and then moved out from there in successive waves. However, what drove their migrations has been a matter of conjecture.
One new explanation is climate change.
Anthropologist Anders Erikkson of Cambridge University in England says the first few hardy humans who left Africa might've gone earlier but couldn't. Northeastern Africa — the only route to Asia and beyond — was literally a no man's land.
An apple a day might keep the doctor away, but what do you do when there are no apples? It's a question western Michigan's apple growers are dealing with this season after strange weather earlier in the year decimated the state's apple cultivation.
Michigan is the third-largest apple producer in the U.S. after New York and Washington, but the state's apples will soon be in short supply. Now in the middle of harvest season, growers are picking only 10 percent to 15 percent of their normal crop.
Here's an old, old, question, but this time with a surprise twist. The question is — and I bet you asked it when you were 8 years old and sitting on a beach: Which are there more of — grains of sand on the Earth or stars in the sky?
Obviously, grains and stars can't be counted, not literally. But you can guestimate.
New York City Mayor Michael Bloomberg speaks to the media at City Hall on September 13, 2012, about limiting the size of sugary drinks.
Credit John Moore / Getty Images
The new ban on the sale of soft drinks in large containers in New York City is arbitrary and insulting.
Just because something is bad, that doesn't mean you should ban it. Bad is something that people need to decide for themselves, for the very simple reason that no one has a monopoly on knowing what bad is.
During the Republican debates, Mitt Romney told a moderator "You get to ask the questions you want. I get to give the answers I want." Social psychologist Todd Rogers talks about how likely voters are to notice a subtle dodge. James Fowler joins to discuss whether social media can send more people to the polls.
In a few weeks, NASA's Curiosity rover may use its powerful drill for the first time on Mars, and that has been a cause of a concern - not because the drill may be malfunctioning, but because the drill bit might be contaminated with germs from Earth.
Last Monday, an amateur astronomer in Wisconsin, Dan Peterson, was gazing through his telescope when he caught sight of a flash of white light in Jupiter's gassy atmosphere. Lucky for him, someone else also had a scope trained on Jupiter that night. George Hall, an amateur astronomer in Dallas caught that flash on video, hard evidence that an explosion had indeed happened on the giant planet.