A new study in fruit flies describes how an animal's gut reacts differently to beneficial microbes versus harmful pathogens.

Losing your baby teeth is a strange experience. The teeth gradually loosen until they're replaced by thicker, more durable ...

Life cycles require the creation of an autonomous individual, that individual’s growth and that individual’s reproduction In ...

Some human organs, such as kidneys and lungs, have back-ups. Some can be lost with little consequence—the spleen, for example ...

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