Changing weather patterns, producing the wrong kind of snow, have transformed the population dynamics of lemmings in northern Scandinavia. The knock-on effects have been felt throughout the ecosystem

Small-scale interactions of substrates with an enzyme's active site — over distances smaller than the length of a chemical bond — can make big differences to the enzyme's catalytic efficiency

The link between a person's genetic ancestry and the traits — including disease risk — that he or she exhibits remains elusive. Routine sequencing of the genomes of an African and an Asian individual offer a step forward