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EarthNight lights may foster depression
In animals, chronic dim light triggers brain changes that disappear with the return of nightlong darkness.
By Janet Raloff -
SpaceCrowd sourcing comes to astronomy
Researchers comb the Internet for snapshots of a comet and use the collected images to calculate its orbit.
By Nadia Drake -
LifePolar bears’ ancient roots pushed way back
Full genetic blueprints suggest the animals split from brown bears millions of years ago.
By Devin Powell -
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AnimalsTiny creature, giant sperm
Giant sperm appear in various other species, including some flatworms, beetles and a fruit fly species, Drosophila bifurca, with sperm nearly 6 centimeters long.