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作者:墨嘶杩    发布时间:2017-05-21 05:00:26    

After seven months of sampling Martian soil near its landing site, NASA’s Curiosity rover has started driving towards its main destination, a hill called Mount Sharp. Curiosity will trek 8 kilometres to reach layered sediments on the mountain’s lower slopes – thought to offer the best chance of finding signs of life. The first plane to fly across the US day and night on solar power alone has completed its five-leg journey, landing in New York on Sunday. The single-seated craft took off from San Francisco in May, flown alternately by Swiss pilots André Borschberg and Bertrand Piccard. The pair intend to fly around the world in 2015 in a two-seater version of the plane. Prolonged exposure to particulate air pollution – tiny pieces of matter in the atmosphere – increases the risk of lung cancer, even when levels are below those considered acceptable by the European Union. That’s according to a meta-analysis of 17 studies in nine countries and 313,000 people. The authors found no threshold below which there was no risk (The Lancet Oncology, DOI: 10.1016/S1470-2045(13)70279-1). The noughties were a dangerous decade. More than 370,000 people were killed by extreme weather events between 2001 and 2010 – a 20 per cent rise over the previous decade, according to a report by the World Meteorological Organization. Not content with being the fastest animal on Earth, the Anna’s hummingbird is also the fastest shaker. An ultra-slow-motion camera has caught the birds performing a micro-shimmy that is 10 times faster than the speed at which a dog shakes after a bath (Journal for Biomechanics of Flight, in press). More on these topics:

 

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