Thinkin" Again

Even on these long hot Summer days I try to accomplish something useful if not physically then mentally. Yesterday, for instance, while laying in the shade, I began to wonder, if poison reaches it's expiration date, is it more poisonous or less poisonous? Or, is oxygen actually slowly killing us but it just takes 75 to 100 years to take effect, unless something else gets you first? Do twins ever stop to think one of them was unplanned and which one was the surprise?