A growing number of experts insist that the concept of post-traumatic stress disorder is itself disordered and that soldiers are suffering as a result
Semiconductors can generate laser light in all colors except one. But new techniques for growing laser diodes could soon make brilliant full-spectrum displays a reality
The mysterious ailment called colony collapse disorder has wiped out large numbers of the bees that pollinate a third of our crops. The causes turn out to be surprisingly complex, but solutions are emerging
An international network for monitoring the flow of viruses from animals to humans might help scientists head off global epidemics
Or does Earth occupy a very unusual place in the universe?
Analyses of primate visual pigments show that our color vision evolved in an unusual way and that the brain is more adaptable than generally thought
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