On a 16-point scale, each point increase in optimism correlated with a 9 percent reduction in stroke risk, according to a study by the University of Michigan.
An exoplanet like a hot Jupiter, orbiting close to its sun, would likely have an aurora up to 1,000 times brighter than one on Earth. Read more on exoplanet aurora.
Researchers at UC San Diego show how solar panels act like giant roof shades and insulators, keeping out sun in the summer and holding in heat in the winter.
Cornell University researchers have found that parent parrots in the wild pass on learned vocal signatures - a bit like human names - to their offspring.
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