3D-printed ‘skin’ could make testing cosmetics on animals obsolete Researchers made a bioengineered hydrogel composite filled with living human cells. By Mack DeGeurin ...

Hundreds of books written by medieval-era French monks were bound with bizarre “hairy” covers from far-away animals — shedding light on a booming trading system, according a new study.

Teeth first evolved as sensory organs, not for chewing, according to a new analysis of animal fossils.The first tooth-like structures seem to have been sensitive nodules on the skin of early fish ...