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. The would-be robber looked at his would-be victim, "like what's going on here? " Diaz replied: "If you're willing to risk your freedom for a few dollars, then I guess you must really need the money. "You know, I just felt maybe he really needs help," Diaz says. Diaz says he and the teen went into the diner and sat in a booth. "The manager comes by, the dishwashers come by, the waiters come by to say hi," Diaz says.
Morning Edition. Hydroelectricity Efficiency. 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.
Large dams, like the Three Gorges Dam in China or the Hoover Dam in the US can consistently produce power at between 85% and 90% annually. There are many smaller dams which produce power at only a 50% efficiency rate. The reasons for this are threefold. However, the hydroelectricity efficiency is far better than that of other alternative energy sources, like wind power, which has only about a 30% efficiency rate (this number varies widely each year, from 20% to 34% and everywhere in between). HuffingtonPost. Psychology Today. Why men are more intelligent than women. 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. More recently, however, especially since the turn of the millennium, there have been an increasing number of studies that cast doubt on this politically correct conclusion. However, these studies do not answer the ultimate evolutionary question of why men should be more intelligent than women.
My LSE colleague, Diane J.