Two years ago we wrote about Norwegian engineer Petter Muren's effort to build a mini copter weighing only 3.3 grams. that radio-controlled craft, the Picoflyer, could take off from the palm of your hand. Now Muren has designed the larger but more capable Black Hornet.
Afghanistan. A hidden bunker. Four men with rifles guard a thick, rusted steel door. Bam! A huge fist pounds against it—from inside. Bam! More blows dent the steel. The hinges strain. The guards cower, inching backward. Whatever's trying to break out is big. And angry.
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Science is reinventing play, from extreme sports to gamification to ridiculous roller coasters to the playgrounds of tomorrow, and this issue is chock full of fun. Also, on a less fun note: Did global warming destroy my hometown?