NOVA

Riddles of the Sphinx A marvel of ancient Egyptian engineering is threatened. Can it be saved? Airs May 18 at 9pm.
Building Pharaoh's Ship Can the legendary trading vessel of an Egyptian queen sail again? Airs May 18 at 10pm.
Photographing the Big Melt Acclaimed photographer James Balog describes his Extreme Ice Survey, a photographic record of arctic and alpine melting. Hear James Balog.
See Spy Photos A surveillance-image specialist analyzes photos of Afghanistan, Iraq, North Korea, and other political hotspots. Take a look.
Digital Diamonds? Hear how synthetic diamonds might pave the way for the electronics of the future. More bling.

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