Forensics

There are thousands of cold cases involving missing persons in the U.S. But there are only about 200 forensic artists trained in a technique that could help solve them.

Some family history websites allow investigators to match DNA samples with relatives, even distant ones. They can then build family trees in the hopes of tracking down the person they're looking for.

Scientists have been analyzing bones first uncovered by a utility crew digging at the Manassas National Battlefield Park in Virginia. The remains provide insights into surgery during the Civil War.