Exploring the Physical World

Although over the centuries we have learned much about our physical world, from the earth below to the stars above, there are still many mysteries to uncover.

When Age Matters

When Age Matters

A partial human skull unearthed in 2008 in northern Israel may hold some clues as to when and where humans and Neanderthals might have interbred. The key to addressing this, as well as other important issues, is precisely determining the age of the skull. A...