RECORD LOW TEMPERATURES FOR ELEMENTARY PARTICLES. In a separate ion trap experiment (paper DP.72 at the APS Santa Fe meeting), Gerald Gabrielse and his Harvard colleagues chilled electrons down to only 70 mK, making this the first time elementary particles had ever been stored at temperatures below 4 K; previously only atoms, which are much heavier composite structures, had been cooled so low. Moreover, one can consider such an electron plus the ion trap itself as forming an "atom," on which interesting "quantum nondemolition" measurements (the quantum state of the electron probed without affecting its energy) of the electron's cyclotron motion around the trap can be carried out in the absence of blackbody photons.