One of the first to record her answer to that conundrum was the Marquise du Chatelet, whom history has recollected as the jilted mistress of Voltaire. That is short shrift: The brilliant marquise was a mother, a shopaholic, a passionate lover -- and most significantly, a revolutionary scientist and mathematician who suspended wooden spheres from the rafters of her country estate to test Newton's theories, and who scribbled her insights until the candles burned to nothingness, plunging her hands into ice water to jolt herself awake. Her intellectual feverishness prompted the philosopher Immanuel Kant to sneer that such a woman "might as well have a beard," and Voltaire himself, having received solo title-page credit for a book he privately admitted she practically dictated to him, declared that the marquise was a great man whose only shortcoming was having been born female.
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