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Julio Diaz has a daily routine. Every night, the 31-year-old social worker ends his hour-long subway commute to the Bronx one stop early, just so he can eat at his favorite diner. But one night last month, as Diaz stepped off the No. 6 train and onto a nearly empty platform, his evening took an unexpected turn. He was walking toward the stairs when a teenage boy approached and pulled out a knife. "He wants my money, so I just gave him my wallet and told him, 'Here you go,'" Diaz says. As the teen began to walk away, Diaz told him, "Hey, wait a minute.
It may be surprising, but hydroelectricity is not only one of the oldest known methods of generating power, but it is also one of the most efficient. A typical, modern hydroelectric plant produces at a 90% efficiency rate 24 hours a day, completely unmonitored. The larger your plant is, the more efficient it is likely to be.
The answer is: They aren’t. The orthodoxy in intelligence research for the second half of the 20th century had been that men and women had the same average intelligence, but men had greater variance in their distribution than women. Most geniuses were men, and most imbeciles were men, they said, while most women were in the normal range. This conclusion, however, was manufactured out of political expediency. Not wanting to discover, or a priori denying, any sex differences in intelligence, psychometricians simply deleted from the standardized IQ tests any item on which the performance of men and women differed.