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The $3 billion Olmsted Locks and Dam project, expected to be finished in 2020, is seen as too big to fail.
Basing their work on the techniques used by octopuses and cuttlefish, US engineers have produced a flexible, colour-changing material.
The remarkably healthy teeth of prehistoric humans in Africa have high levels of compounds found in purple nutsedge, which may have helped ward off cavities.
Two Russian cosmonauts set off on a spacewalk from the International Space Station (ISS) to launch a nano-satellite.
Two rare birds usually found in the Mediterranean region are spotted building a nest at a nature reserve in Lincolnshire.
A garden curator at Duke University happened upon a box huckleberry shrub thought to be 800 years old, and relatively young at that.
The risk of an eruption at Iceland's Bardarbunga volcano has increased, as well as the risk level to the aviation industry, meteorologists say.
Africa's elephants have reached a tipping point, where more are being killed each year by poachers than are being born, a study suggests.
A gorge in Taiwan, cut through rocks raised by a 1999 earthquake, is disappearing at an unprecedented rate, along with geological evidence.