Jul 30, 2014 — Hamas militants are using tunnels in and out of Gaza to strike inside Israel. Israelis are questioning how the tunnels grew to be so complex and why the military hasn't been able to shut them down.
Jul 31, 2014 — Mummies from Ancient Egypt, Peru and the U.S. all show signs of hardened arteries. But why? Researchers say bad hygiene, open hearths and maybe some deeply ingrained genetic factors were to blame.