> .. an Almost zero negative mass Neutrino would seem to go at speed of light, unless you measured very carefully. A higher energy might imply a more negative mass thus more noticeably faster than speed of light. I saw someplace some ask if Neutrinos might be the hypothetical Tachyons. >>/ My recollection from figuring done 10 to 20 years ago is that past C, energy initially DROPS as velocity increases, reaches a minimum about 2.X c and then climbs again. That depends on how you interpret the imaginary quantities and I may well have got it wrong. I wrote a short never published (no surprise ;-) ) =A0 "Probability 0" type Science Fact story based on this re a tunnelling FTL drive. If there ever is a FTL drive it MUST tunnel =A0 =A0 =A0 R --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .