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EarthPCBs can taint building caulk
Long-banned, toxic polychlorinated biphenyls in some building caulk applied in the 1960s and 1970s may still pose an exposure risk.
By Janet Raloff -
Health & MedicineBirthing age and ovarian cancer risk
Giving birth confers on women some protection against ovarian cancer, and the later in life the last pregnancy happens, the better the protection.
By Nathan Seppa -
AnthropologyChimps mature with human ancestor
The Stone Age human ancestor Homo erectus grew at about the same pace as wild chimpanzees today do.
By Bruce Bower -
AstronomyCassini eyes Iapetus
Only a few days after it entered orbit around Saturn, the Cassini spacecraft captured an image of Saturn's split- personality moon Iapetus.