News
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The origins of immunity?
In social amoebas, sluglike clusters of usually independent organisms, certain cells take on a protective role that hints at the origin of immune systems in higher animals.
- Animals
Tail singers
The male Anna's hummingbird impresses females and intimidates other males by making a whipping sound with its tail feathers.
- Physics
Road Bumps: Why dirt roads develop a washboard surface
Experiments and a computer simulation show why dirt roads develop a washboard surface, and indicate the only way to prevent it: Drive very slowly.
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Depression Defense: Sick elderly get mood aid from home treatment
Instructional therapy to promote coping strategies helps elderly people with incipient blindness ward off depression—at least in the short run.
