Light on silicon better than copper?

DURHAM, N.C. — Step aside copper and make way for a better carrier of information — light.
As good as the metal has been in zipping information from one circuit to another on silicon inside computers and other electronic devices, optical sig…

Growing Human Skin in Laboratory Can Prematurely Age Cells

Children who receive laboratory-expanded sheets of their own skin to cover severe burns are saved from certain death, but their new skin can have the cellular age of an 80 year old, according to a study at Duke University Medical Center. The process of growing small patches of human skin into larger sheets, called tissue engineering, makes cells divide so many times that the skin becomes prematurely aged at a cellular level.