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Watch the complete July 23, 2008 broadcast of NOVA scienceNOW here. To watch any of our segments from past episodes online, go to past stories.

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Running time: 2:09

Leeches

Leeches

A century after falling out of favor among doctors, medicinal leeches are back in hospitals, sucking away on patients' wounds.
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The Search for ET

The Search for ET

Astronomers have their radio telescopes tuned to receive signals from alien worlds, but is anybody out there?
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Stem Cells Breakthrough

Stem Cells Breakthrough

Three separate teams overcome a biomedical hurdle—creating stem cells without the use of human embryos.
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Profile: Edith Widder

Profile: Edith Widder

Meet a marine biologist and explorer who has engineered new ways to spy on deep-sea creatures.
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