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In this essay, we assume that negative mass objects can exist in theextragalactic space and analyze the consequences of their microlensing on lightfrom distant Active Galactic Nuclei. We find that such events have very similarfeatures to some observed Gamma Ray Bursts and use recent satellite data to setan upper bound to the amount of negative mass in the universe.Comment: Essay awarded ``Honorable Mention'' in the Gravity Foundation  Research Awards, 199

WORMHOLES, GAMMA RAY BURSTS AND THE AMOUNT OF NEGATIVE MASS IN THE UNIVERSE