News
- Earth
Lead delays puberty
Even low concentrations of lead in a girl's body may delay her reproductive maturation.
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Calling out the cell undertakers
Dying cells secrete chemicals that attract other cells that specialize in disposing of cellular corpses.
- Paleontology
Alaska in the ice age: Was it bluegrass country?
At the height of the last ice age, northern portions of Alaska and the Yukon Territory were covered with an arid yet productive grassland that supported an abundance of large grazing mammals, fossils suggest.
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Attack of the cannibalistic bacteria
When nutrients are low, some members of a bacterial species will cannibalize other members.
