The space shuttle Columbia disintegrated upon re-entry over Texas Saturday morning moments before its seven-member crew was scheduled to land in Florida.
By PBS NewsHour
The following is the text of a NASA statement on the loss of the Space Shuttle Columbia.
French company Clonaid's self-imposed 10-day deadline for providing DNA proof of the existence of the first human clone passed Tuesday without any new evidence from scientists.
Stanford University announced on Tuesday that its researchers will work to create new stem cell lines by employing nuclear transfer technology --a process that can be interpreted as cloning.
When Internet filters in schools and libraries are set at their most restrictive levels, they can block some of the health information that young people seek when they go online, according to a study released by the Henry J. Kaiser…
Ray Suarez speaks with Eric Klinenberg about his new book on the 1995 Chicago heat wave.
A United Nations summit aimed at improving living conditions for the world's poor without damaging natural resources opened Monday in the South African capital of Johannesburg.
President Bush's Council on Bioethics rejected a permanent ban on cloning but disagreed over whether limited scientific research should be allowed to go forward or a moratorium put in place.
Despite final Congressional approval to build a massive nuclear waste disposal site under Yucca Mountain northwest of Las Vegas, officials in Nevada pledged to fight the project in court.
Over the objections of Democratic leaders and Nevada's representatives, the U.S. Senate approved federal plans to build a massive nuclear waste storage site under Yucca Mountain, some 90 miles northwest of Las Vegas, Nevada.
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