Human embryos are more muscle-bound than adult humans, new microscope images cataloging early development show. For instance, at seven weeks of gestation, embryonic hands have about 30 muscles. Adults ...

Jessica Hughes is seeing the human finger in a new light through her undergraduate research project. A recipient of Penn State’s 2010 Undergraduate Discovery Summer Grant, Hughes has spent the summer ...

Hold your hand in front of you, palm up and fingers splayed. Now bend your fingers at their first joint past the knuckles. Your hand should look a bit like a spider on its back, curling up its legs — ...