Your ski buddy has a 92 percent chance of survival after being buried for 15 minutes and a 30 percent chance after 35 minutes. Your search had best be efficient. Whereas most transceivers use confusing audio-based directional cues, the S1's electromagnetic sensors map victims' positions and depths on an LCD screen. The S1 gives signatures for up to four people-crucial for multiple burials. $650
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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?