cell phone – GLOBAL IDEAS Blog https://blogs.dw.com/globalideas Thinking for a cooler world Thu, 02 Oct 2014 08:32:05 +0000 en-GB hourly 1 How many praying mantises does it take to power a smartphone? https://blogs.dw.com/globalideas/how-many-praying-mantises-does-it-take-to-power-a-smartphone/ Mon, 17 Oct 2011 14:15:11 +0000 http://blogs.dw.com/globalideas/?p=3801