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Drive that stores more

• Scientists at the University of Alberta in the US have created the most dense solid-state memory device. It can store a thousand times more data than current computer storage devices. The scientists used the technology they developed to manufacture atomic-scale circuits to make this drive, said lead researcher Roshan Achal.

Never hungry

• In the ocean off the coast of Antarctica, a snail called Gigantopelta chessoia lives around scorching hydro-thermal vents. Once it reaches a certain length, its digestive system stops growing, reports the Proce-edings of the Royal Society B. Its teeth, stomach and intest-ine make way for an esophageal gland, which gets so big it takes up most of the snail's body. Bacteria colonise it, and the snail no longer needs to eat. Instead it just sits there getting bigger, surviving on energy the bacteria produce.

Urban survivor

• White clover is one of the most rapidly evolving species of flora, learning quickly how to survive in tough urban environments, says a study in the Proceedings of the Royal Society B. For instance, clover in cities does not produce hydrogen cyanide, a toxin that protects it from grass-eating animals. Number of plants produc-ing the toxin increases with distance from the city.

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