NOVA scienceNOW : 44 - Leeches, The Search for ET, Stem Cells Breakthrough, Profile: Edith Widder
Leeches - 02:00 Leeches can consume seven or eight times their body weight in blood, says leech expert Mark Siddall. As doctors are now discovering, this talent, along with the bloodsuckers' natural anti-coagulant, can benefit patients who have had fingers or toes reattached. Find out how in this video segment. SETI: The Search for ET - 13:50 In 1960 an inquisitive astronomer named Frank Drake aimed a radio telescope at a couple of nearby stars and started listening. Nearly 50 years later we're still listening, and SETI—the Search for Extraterrestrial Intelligence—has just expanded to begin the systematic survey of millions of star systems for signs of advanced civilizations. The Allen Telescope will eventually comprise 350 dish antennas, all working in unison to answer the question: Are we alone? Stem Cells Breakthrough - 25:55 In a July 2008 update on the controversial subject of stem cell research, NOVA scienceNOW explores a potentially revolutionary development. Japanese researcher Shinya Yamanaka first discovered how to take ordinary skin cells from an adult mouse, turn back their genetic clock, and transform them into the equivalent of embryonic stem cells. Yamanaka called them Induced Pluripotent Stem (iPS) cells. He and other biomedical researchers can now create human iPS cells without using human embryos, thus bypassing a political and ethical stumbling block that has hampered stem cell research. Medical scientists are eager to explore the full potential of stem <b>...</b>
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