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Scientists defy gravity with 'perpetual' water pump
Scientists have figured out how to pump water upwards in a thick tube using a combination of surface tension and water-repellent materials. Before you get your hopes up, it's definitely no perpetual-motion machine -- but the discovery from Beihang University researchers in China could bring other benefits. Here's how it works: The right angle pipe shown above is filled with a small amount of water, which can't drain thanks to a copper mesh doped with a superhydrophobic (water-rejecting) material at the bottom. When a small droplet is introduced, it's drawn upward by surface tension, albeit very slowly (the above GIF is sped up about 75 times).
Study finds that anger spreads further than joy on social networks
Want to get your message heard on a social network? Try raging about it. China's Beihang University has published a study of Sina Weibo users which suggests that anger-fueled online posts have more of an influence than those reflecting other emotions. During the research period, a typical bitter comment would affect posts three degrees removed from the original; joy had a muted impact, while disgust and sadness hardly got any traction. Don't be too quick to lament the human condition, though. As researchers note, many of the angry posts were triggered by politics in Weibo's native China. There's a chance that internet denizens on other social networks have a rosier outlook on life. [Image credit: Wayne Marshall, Flickr]
