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...this scenario was rudely challenged last week by Kevin Pope, a former NASA scientist. Reviewing recent studies of atom-bomb blasts and analyses of particles in strata at the 65 million-year level, he concluded in Geology that most of the dust particles were too large to have remained suspended in the air for many months. The finer particles that stayed airborne would not have blocked enough sunlight to cause mass extinctions. Pope speculates instead that soot from the worldwide conflagrations, sulfate aerosols and other impact phenomena were to blame. His findings prompted such headlines as ALVAREZ TEAM WAS WRONG...
Just as the foundations of Harvard’s Afro-American studies department appeared most unstable, the appointment of political scientist Michael C. Dawson has brought timely reinforcement to the “dream team...
...will be a major figure in the department,” Gates said. “He is the leading black political scientist in the world and a leading scholar of black politics. He would be a great leader of the department...
Statistics clearly point out how dangerous 16-year-old drivers of either sex are. According to Allan Williams, the chief scientist for the Insurance Institute for Highway Safety, the crash risk of a 16-year-old is more than twice that of 18- or 19-year-olds. The reasons are simple: immaturity and lack of driving experience. Williams points to another frightening fact: whenever two or more teens are in a car together, the already high crash risk shoots up. Cars with two or more teens are four times as likely to crash as are cars with teens driving solo...
...been on target, says Donald Yeomans, a senior scientist at the Jet Propulsion Laboratory, it would have struck with the explosive force of some 4,000 megatons, enough to obliterate a major metropolitan center and the surrounding countryside. But what troubles most scientists is that the asteroid was detected only two weeks before it flew by. If it had been headed toward impact, those in the target area would have had barely enough time to write their wills. Eleanor Helin, whose Near-Earth Asteroid Tracking group discovered the asteroid, estimates that, on average, one object the size...