In the ultrahigh vacuum of a scanning tunneling microscope, a hydrogen molecule is held between the silver tip and sample. Femtosecond bursts of a terahertz laser excite the molecule, turning it into… [+4368 chars]
Cambridge scientists have rejuvenated the skin cells of a 53-year-old woman, rewinding the biological clock by 30 years. In an experiment simulating a skin wound, these cells showed signs of behavin… [+3816 chars]
