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This cheap solar-powered water filter could remove contaminants Credit: Xiaohui Xu/Princeton University A new invention that uses sunlight to drive water purification could help solve the problem of providing clean water off the grid. The device resembles a large sponge that soaks up water but leaves contaminants – like lead, oil and pathogens – behind. To collect the purified water from the sponge, one simply places it in sunlight. The researchers described the device in a paper published this week in the journal Advanced Materials. The inspiration for the device came from the pufferfish...

‘There are no silver bullets’ in conservation: Synchronicity Earth’s Jessica Sweidan Conservation is complex. If it were easy, problems like the extinction crisis, human-wildlife conflict, overexploitation of forests and oceans, and habitat degradation and loss would be resolved already. Conservation’s complexity arises from the need to address multiple, often conflicting, objectives that span disciplines from ecology to economics to human welfare. Synchronicity Earth, a U.K.-based charity, recognizes this and incorporates the idea of complexity into its strategy, looking to opportuni...

February 14, 2021 February 13, 2021 POV: Spring classes have just started. You’re finally out of arrival quarantine, so you have unlocked the ability to take your daily walks off campus. But you don’t. Sure, there’s the occasional trek up to Nassau Street for a stop at Small World or Tico’s, or sometimes you stroll around the neighborhood behind McCarter Theatre for some scenic variety. More often, you stick to the well-worn footpaths through Prospect Garden, wander among the Rocky courtyards, or perhaps trek all the way down to Poe Field to reminisce or wonder about what campus used ...