When a knot lets go, it doesn't just fall apart. It snaps. That simple observation led Penn Engineers to rethink what a knot ...

Researchers at Penn Engineering have turned a common nuisance—a knotted string—into a high-performance, heat-activated ...

PBS NC helps your community explore new worlds and ideas through programs that educate, inform and inspire. Your ...

I try to be merciful in my garden – but in my veg patch these munching molluscs are doomed ...