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. Believe it or not, there's a lot of food involved in
wet-plate photography. Egg whites (albumen) are used to make the
glass plates adhesive to the light-sensitive chemicals. And one
way to keep the plates from drying out after processing is to
coat them in honey. It's also physically demanding, so you get
really hungry. On this morning 150 years ago, Union and
Confederate troops clashed at the crossroads town of Sharpsburg,
Md. The Battle of Antietam remains the bloodiest single day in
American history. The battle left 23,000 men killed or wounded
in the fields, w