From 1996, my trusty Casio fx-570s calculator has been with me and haivng spent so many years with it I can say that it has a certain sentimental value. For the first time, I witnessed the calculator automatically shutting down its power. No, its not that there isn't any more battery life, its a function of the battery. Its quite amazing really considering the number of years I have spent with this calculator. Only today did I witness this "spectacular, amazing" act of "nature" or rather, electrical engineering. :)
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