THE WIND-WIND COLLISION (WWC) IN ECCENTRIC MASSIVE BINARY SYSTEMS PRODUCES PREDICTABLY VARIABLE X-RAY PLASMA. THIS NEARLY CONTROLLED COLLISION PROVIDES AN IDEAL LABORATORY FOR SHOCK ASTROPHYSICS PROVIDING KEY CONSTRAINTS ON HOW GAS THERMALIZES AT VARIABLE DENSITY AND ON PARTICLE ACCELERATION. JOINT XMM-NEWTON AND NUSTAR OBSERVATION OF WR 140 IN AO14 DISCOVERED AN EXTREMELY HARD X-RAY COMPONENT WHICH CAN ORIGINATE EITHER FROM A KT ~13 KEV PLASMA OR INVERSE COMPTON SCATTERING. WR 140 WILL EXPERIENCE ITS PERIASTRON PASSAGE IN 2016 A CRITICAL TIME WHEN THE WWC EMISSION CHANGES DRAMATICALLY. WE PROPOSE JOINT XMM-NEWTON/NUSTAR OBSERVATIONS OF WR 140 AT KEY PHASES AROUND PERIASTRON IN AO15 TO DETERMINE THE ORIGIN OF THIS COMPONENT AND UNDERSTAND THE X-RAY MINIMUM.