Good liquid, bad liquid (Video)

For airline passengers everywhere, good news. Scientists have successfully tested a liquid explosive detection system that may eventually keep dangerous substances off airplanes. This comes barely two years after a plot to ...

Long-extinct passenger pigeon finds a place in the family tree

With bits of DNA extracted from century-old museum specimens, researchers have found a place for the extinct passenger pigeon in the family tree of pigeons and doves, identifying for the first time this unique bird's closest ...

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