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The heart of a Daphnia pulex (a milimeter-long crustacean in plankton, commonly called a "water flea") is programmed for a fixed number of palpitations, before the animal dies of natural causes. It is observed that the water flea lives twice as long at 15C than at 25C. Assuming an Arrhenius-like behaviour for the reaction rate, estimate the activation energy for the reaction that controls the heart palpitations. (For general information, at 298K a D. pulex lives about 45 days. If fed in a medium with a steady concentration of 0.08mg/ml of caffeine, the life-span is cut by 28%. On the other hand, if fed with a steady 8% of ethanol, the life span increases by about 85\%. [See: A. Kundu \& G. Singh, F1000 Research 7 (2018) 254.])