In the harsh desert steppe of far northwestern China five prehistoric-looking Przewalski's horses, once classed as extinct in the wild, emerge from the endless plains.

Biology - Plants & Animals

Jun 14, 2013 4.8 / 5 (4) 0

Climate records captured in Siberian caves suggest 1.5 degrees of warming is enough to trigger thawing of permafrost, according to a paper to be given at the Geological Society of London on 27 June.

Space & Earth - Earth Sciences

18 hours ago 4.7 / 5 (3) 0