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Wiggle, Twitch, Squirm: Watch How Guts Grow

In the grayscale of a laboratory video, the little tubes squirm. They pulse as waves of contraction travel along their length — they almost seem to dance as the squeezing stretches them rhythmically. And, curiously, they grow. These tubes are individual lengths of intestine, taken from a chicken embryo. And …

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A Virus in Koala DNA Shows Evolution in Action

Koalas have been running into hard times. They have suffered for years from habitat destruction, dog attacks, automobile accidents. But that’s only the beginning. They are also plagued by chlamydia and cancers like leukemia and lymphoma, and in researching those problems, scientists have found a natural laboratory in which to …

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Natural ‘bumblebee medicine’ found in heather

Image copyright Hauke Koch Image caption Bumblebee foraging on heather (Calluna vulgaris) Preserving heather in the natural landscape could have benefits for wild bees, according to new research. Nectar – and therefore honey – from the plant contains a natural “bumblebee medicine”, which is active against a harmful bee parasite. …

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