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When is a wing not a wing? When its a helmet. Insect wings vary enormously in size and shape, but all have one thing in common — they grow out of the second and third of the three segments of the thorax. Or do they? Prud'homme and colleagues have been looking at the treehoppers, close relatives of cicadas that have a bizarre and varied structure called the 'helmet' growing from the wingless first thoracic segment. The helmet is classically described as a cuticular expansion of the first thoracic segment. Closer examination shows that, in evolutionary terms, it corresponds to a third pair of wings. A striking feature of body plans is their relative stability over long evolutionary times. The discovery of this previously unknown variation of the blueprint for insects illustrates how a structure relieved of its original role is free to evolve new functions and morphologies. On the cover, the treehopper Hemikyptha marginata. Cover image: Nicolas Gompel.
Reusable commercial rockets will soon be able to take scientists — and tourists — on suborbital spaceflights. Are these vehicles vital research tools, or an expensive dead end?
Creating more exotic isotopes will reveal the stellar formation of atoms — a fitting tribute to Ernest Rutherford, say Michael Thoennessen and Bradley Sherrill.
As he releases a 3D documentary about the prehistoric paintings in Chauvet Cave in southern France, Werner Herzog — the German director of Fitzcarraldo and Grizzly Man — talks about cave art and the hostility of nature.
Treehoppers produce highly diverse structures called helmets. To do so they seem to have exploited the genetic potential, long inhibited in other winged insects, to develop wings on a particular anatomical segment. See Letterp.83
The biosynthetic route to a naturally occurring insecticide, spinosyn A, has been established. One of the enzymes involved might catalyse a reaction that, although widely used by chemists, has proved elusive in nature. See Letterp.109
Heart failure is characterized by weakened contractions of heart muscle. A drug that directly activates the key force-generating molecule in this muscle may be a valuable tool to strengthen the failing heart.
In the science of measurement, increasing the sensitivity to the quantity being measured while minimizing the susceptibility to noise is a challenge. A technique demonstrated with a single electron spin may help to tackle it. See Letterp.61
Single chains of a specially designed polymer fold up in water to form an encapsulated catalytic chamber. This supramolecular assembly strategy mimics the one used by enzymes in nature.
Researchers who can grasp the intricacies of the immune system and enjoy distilling meaning from large data sets are in demand for a growing subfield of systems biology.