Human genetics: Muscling in on hominid evolution A molecular difference in the jaw muscles of human and non-human primates has tantalizing echoes in the fossil record. Was this divergence a central event in the evolution of the skull of modern hominids?

RNA interference: Human genes hit the big screen Genetic screens are powerful tools for identifying the genes involved in specific biological processes. At last, RNA interference makes large-scale screens possible in mammalian cells

Earth science: Putting the squeeze on oxidation The results of experiments conducted under the extreme temperature pressures conditions of Earth's lower mantle suggest that at these depths low oxygen content is no barrier to iron oxidation.