EXACOMPUTING's sHOWsTOPPER It's a threat from outer space. Seriously. P. 30 FACING THE WORsT AT FUKUsHIMA Muon detectors can "see" the melted mess P. 36 THE 800-KM EV BATTERY Lithium-air cells will power future cars P. 42 THE ONCE ANd FUTURE sUPERCOMPUTER The quest for a superconducting machine P. 54 FOR THE TECHNOLOGY INSIDER | 03.16 THE sMART TENNIs RACKET Chips in clubs, bats, rackets, and balls are helping elite athletes sharpen their games P. 48