Word: proof
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Dates: during 1980-1989
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...impossible to mistake the wearer for anyone else, except possibly Martin Van Buren, the eighth President of the U.S. New Age inquisitors remain one of the few puzzles Asimov is unable to crack: "I have never found a way to convince them. They tell me there is 'absolute proof' of aliens landing on this planet. They read it with their own eyes. It turns out they read it at the supermarket checkout counter, trying to escape from reality...
...give you good health and a bullet proof vest...
...vigilance and caution will not help much. The administration should not wait for more intrusions and another rape before they reform the security system. We do not need further proof that Harvard's security system is too porous to be accepted...
...though HDL's relationship to coronary heart disease was first noted in 1951, many people are still not being advised by their doctors to raise their good-cholesterol levels. The reason, says Dr. Robert Levy, president of New Jersey's Sandoz Research Institute, is that there is no absolute proof that raising HDL alone can lower a person's risk of heart disease. No convincing body of evidence from animal studies has yet demonstrated the value of raising HDL, and no clinical trial to date has specifically targeted humans with low HDL. "Much the same question existed for LDL until...
...wouldn't consider it [proof of intent] the key to unlock the door. I wouldn't say that any given item is the hinge" of the case, he said...