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Health & MedicineMicrobe Hunt: Novel bacterium infects immune-deficient people
A newfound bacterium can cause illness in people who have a rare, inherited form of immune deficiency.
By Ben Harder -
AnthropologyBranchless Evolution: Fossils point to single hominid root
Fossils of a 4.1-million-year-old human ancestor in Ethiopia bolster the controversial idea that early members of our evolutionary family arose one species at a time rather than branching out into numerous species.
By Bruce Bower -
AnimalsFoodfree growth
Rattlesnakes undergo a hibernation-like state to survive long periods of famine, while continuing to grow longer.
By Janet Raloff -
Health & MedicineAlcohol spurs cancer growth
Downing the human equivalent of two to four alcoholic drinks per day dramatically spurs the growth of cancers implanted in lab mice.