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厦门玻尿酸隆鼻最好的医院飞健康漳州治疗青春痘

2019年09月21日 07:24:31来源:99媒体

  • What makes the human brain so special? Actually, it mightnot be that special after all.所以说是什么让人类的大脑如此特别?实际上,这或许根本就不特别。In , Dr. Suzana Herculano Houzel and her colleagues showed that the human brain has thesame density of nerve cells as other primates. Comparing humans to smaller primates, she claimsthat our brain is no bigger than it should be for our body size. Still, given the distinctive way thatprimate brains scale with size, we may have the most brain cells of any mammal.在年,苏珊娜·埃尔库拉诺·乌泽尔士和她的同事们展示了人类大脑的神经细胞密度和其它的灵长类动物一样。与其它较小的灵长类动物相比,苏珊娜士称我们的大脑与我们自身体型相比并不算大。但考虑到灵长类动物大脑尺寸比例的独特方式,人类拥有所有哺乳动物中最多的脑细胞。That being said, gorillas can grow to be three times our size, but still have much smaller brains thanours.话虽如此,大猩猩能长到我们体型的三倍,但它们的大脑仍然比我们小得多。Brain cells need more energy than most body cells. Although the brain is less than 2 percent of themass of the human body, it consumes 20 percent of our resting metabolic energy. Gorillas haveto spend more than eight hours every day eating to get enough calories to support their bigbody, and they simply cant afford a bigger brain.脑细胞比其它身体细胞需要更多的能量。虽然大脑所占人体的比重小于2%,但它却消耗我们静止时代谢能的20%。为了给庞大的身躯提供足够的能量,大猩猩每天要花费超过8小时的时间进食,因此它们无法负担更大的大脑。So, then, how did human ancestors overcome this limitation? Beginning with homo erectus, abouttwo million years ago, our ancestors couldnt have afforded the metabolic cost of their increasinglylarge brains if they ate raw food like gorillas do.所以,人类的祖先又是如何突破限制的?从直立的人类开始,大约两百万年前,随着大脑越来越大,如果人类的祖先还像大猩猩那样进食生的食物,那么他们将无法给大脑提供足够的代谢值。Primatologist Richard Wrangham thinks that the invention of cooking with fire is what made thisgrowth in brain size possible. Cooked food is easier to digest and yields more calories. Cooking mayhave made the human brain possible, and freed us from having to spend all day eating.灵长类动物学家理查德·兰厄姆认为发明用火烹饪,使得大脑生长变大成为可能。烹煮的食物更容易消化并且能产生更多的热量。烹饪或许促进了人脑的形成,并将人类从整日进食的境况中解放出来。 /201503/363315。
  • You might have seen reports about a small town, fewer than 300 people, with a force of 110 reserve police officers. How and why is this happening in Oakley, Michigan?Oakley, Michigan, according to reporter Ryan Felton from Metro Times, is ;a textbook definition of a small town.;In the past, the village has had one part-time police chief. Now that the Village of Oakley has hired Rob Reznick, however, its begun a reserve police force as a way to raise money.;Basically you have a guy who saw an opportunity to fund his department by allowing people to apply as a reserve officer,; Felton said. ;If they paid for their uniform, badge, and firearm, and passed a number of tests, they would be able to work as a volunteer cop, and that usually rounded out to about 00 to cover the total cost as it was explained to me.;And tens of thousands of dollars worth of donations from reserve officers have poured into the city.The people on the reserve police force of Oakley, Michigan, do not need to actually live in Oakley. They can live anywhere. In fact, 98% of people who have applied to be a reserve officer are from Wayne, Oakland, and Macomb counties.;It runs the gamut of wealthy professions,; Felton said. ;Everyone from doctors, attorneys, you have a former Detroit Lions football player who now plays for the Miami Dolphins. I mean its an astounding, remarkable cadre of officers that hes collected for his volunteer force.;Once accepted, these reserve officers have police powers while in the presence of one of Oakleys certified officers, as well as a special gun permit.Oakley residents are ;split right down the middle; on this issue, Felton said.;The dynamic in the room during some of these meetings was just one of the most fascinating experiences to watch because it was just like watching this ugly family feud just play out wide in the open, because youre not talking about people who are unfamiliar with each other,; he said.;On one side of the room you have people who are very happy that Rob Reznick has brought in such a significant amount of money,; Felton said, adding that donations from the volunteers have brought in as much as the town spends in a year on general fund expenditures.;But, on the opposite end, you have people who feel like this has just created this sort of pay to play atmosphere and Resnick is able to just do as he pleases,; he said.201503/365099。
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