Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
A common vampire bat (Desmodus rotundus) in flight, photographed in Mexico. These blood-feeding bats have evolved the ability to detect infrared (IR) radiation as a means of locating hot spots on warm-blooded prey. Only three other vertebrate lineages have this 'sixth' sense: three distantly related groups of snakes (pit vipers, pythons and boas). In all cases, the IR sensor is a highly specialized facial structure called the pit organ. In the snakes, a non-heat-sensitive ion channel (vertebrate TRPA1) has become an infrared detector. As reported in this issue, vampire bats use a slightly different molecular mechanism whereby RNA splicing generates a variant of the ubiquitous TRPV1 heat-sensitive channel that is tuned to lower temperatures. Comparison of this channel's gene sequence with the equivalent in other mammals lends support to the hypothesis based on molecular data that these bats are evolutionarily grouped with horses, dogs, cows, moles and dolphins (in the Laurasiatheria superorder), rather than with humans, monkeys and rodents (in the Euarchontoglires) as originally proposed on anatomical criteria. Cover: Barry Mansell/naturepl.com
On the twentieth anniversary of the World Wide Web's public release, Oren Etzioni calls on researchers to think outside the keyword box and improve Internet trawling.
There could be unexpected consequences if greater understanding of disease genetics gives parents more choice in what they pass to their children, says David B. Goldstein.
The Moon's cratered surface preserves the record of impacts that occurred during the late stages of its accretion. New simulations show that a collision with a companion moon may have formed the lunar farside highlands. See Letter p.69
Twenty-five years on from its discovery, high-temperature superconductivity remains without a satisfactory explanation. The latest studies on the electronic phase diagram of copper oxide compounds reveal why this is so. See Letter p.73
Whether African savannahs had an impact on the evolution of our early ancestors has been a matter of debate. A study of carbon isotopes from ancient soils provides fresh clues. See Article p.51
Vampire bats sense infrared radiation to locate places where blood flows close to their prey's skin. At a molecular level, this ability is underpinned by the intricate redesign of an ion channel on facial nerves. See Letter p.88
Marine algae known as coccolithophores produce much of the ocean's calcium carbonate. A large survey reveals how these organisms' calcification processes and species distribution change in response to carbon dioxide levels. See Letter p.80