Virology: Viruses switch hosts to evolve

Viruses more often evolve by jumping from one host species to another than by remaining within a particular species.Edward Holmes and his colleagues at the University of Sydney in Australia compared the evolutionary histories of 19 virus families with those of their animal or

Energy: Sodium battery packs a punch

A cheap, rechargeable sodium-based battery could one day deliver high power at room temperature thanks to its hybrid solid electrolyte.Electrolytes allow electrical charge to flow between a battery’s electrodes. Liquid electrolytes can leak and tend to react with sodium metal, an abundant, low-cost material