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AstronomySolar magnetism: Memories are made of this
Despite all its upheavals, the sun's magnetic field has a built-in memory, allowing it to return to its original position and configuration.
By Ron Cowen -
Drugs order bacteria to commit suicide
Seeking to explain how antibiotics work, scientists find a protein that commands bacteria to kill themselves.
By John Travis -
EarthEl Niño: It’s back!
An increase in ocean temperatures in the central Pacific heralds the onset of El Niño, whose effects should show up in the United States this fall.
By Sid Perkins -
Malaria parasite reveals old age
The DNA of a malaria-causing parasite suggests it is at least 100,000 years old.