As you've probably experienced firsthand, some mosquito species have a real taste for warm, human blood. So much so that if you raise them on it the lab, they'll accept no substitute. Fortunately, I don't get major reactions at all. Brad Main is a mo

发表于:2018-12-24 / 阅读(203) / 评论(0)

未知分类

科学美国人60秒 SSS Ancient Biblical Scroll Gets Read While Wrapped

In the 1970s, researchers unearthing an ancient synagogue at Ein Gedi, near the Dead Sea, discovered the structures Holy Arkthe container in which early Jews would have stored the Bible as they prayed. The site was home to a large Jewish community fr

发表于:2018-12-24 / 阅读(190) / 评论(0)

未知分类

科学美国人60秒 SSS Remote Door Controls Are Car Security Flaw

Today's cars have loads of computer smarts built in. Like the chips that allow you, with the push of a button to unlock your car. And as new cars move down the assembly line, automakers program those functions into the car. They produce one car and t

发表于:2018-12-24 / 阅读(193) / 评论(0)

未知分类

科学美国人60秒 SSS Pigeon Pb Proxies Could Cut Kids' Blood Tests

Pigeons. Ever since humans established permanent agricultural settlements, weve lived side-by-side with the birdsor, as some people call them, rats with wings. They walk on our sidewalks, roost on our buildings, and eat our leftovers. But soon pigeon

发表于:2018-12-24 / 阅读(139) / 评论(0)

未知分类

科学美国人60秒 SSS Model Black Hole Re-Creates Stephen Hawking Prediction

Black holes got their name because light can't escape them, beyond a certain radiusthe event horizon. But in 1974 Stephen Hawking proposed that quantum effects at the event horizon might cause black holes to benot completely black. Hawking said that

发表于:2018-12-24 / 阅读(160) / 评论(0)

未知分类

科学美国人60秒 SSS Ancient Mexican Metropolis Engaged in Hare-Raising Activity

As humans developed civilizations in Eurasia and Northern Africa, they also domesticated animals for food and labor: horses, cows, goats, pigs, sheep and a few others. But no evidence existed for the deliberate cultivation and breeding of animals in

发表于:2018-12-24 / 阅读(146) / 评论(0)

未知分类

科学美国人60秒 SSS Voters Are Seldom Swayed by Local Campaign Stops

Donald Trump hasn't been running the most traditional campaign. And it's not just the unfiltered tweets. He's neglecting campaigning full stop. Thomas Wood, an assistant professor of political science at Ohio State. He's had about half as many public

发表于:2018-12-24 / 阅读(298) / 评论(0)

未知分类

科学美国人60秒 SSS Humans Are Superpredators in the Landscape of Fear

Small carnivoreslike foxes or raccoons or badgersare themselves prey for larger predatorslike wolves. So they spend time hiding instead of hunting. This influence that big predators have on their ecosystem is called a landscape of fear. But humans ar

发表于:2018-12-24 / 阅读(226) / 评论(0)

未知分类

科学美国人60秒 SSS A Green Solution to Improve Indoor Air Quality

Air pollution outside is easy to spot, hanging over the city, or sputtering from a tailpipe. But there's lot of indoor air pollution, too, even if it's not as obvious. It's caused by volatile organic compounds, or VOCs. They can come from building ma

发表于:2018-12-24 / 阅读(220) / 评论(0)

未知分类

科学美国人60秒 SSS Waste Amphetamines Alter Underwater Ecosystems

Last week, tens of thousands of gallons of sewage gushed into urban streams in Baltimore, because of leaky pipes and flooding rains. And when that happens, it's not just organic matter and microbes that get flushed into aquatic habitats. It's drug re

发表于:2018-12-24 / 阅读(148) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-20

Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到听力原文收集区，您将会获得10到30积分的奖励! Thank you！

发表于:2018-12-24 / 阅读(145) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-21

发表于:2018-12-24 / 阅读(135) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-22

发表于:2018-12-24 / 阅读(127) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-25

发表于:2018-12-24 / 阅读(153) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-26

发表于:2018-12-24 / 阅读(150) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-27

发表于:2018-12-24 / 阅读(127) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-28

发表于:2018-12-24 / 阅读(133) / 评论(0)

未知分类

科学美国人60秒 SSS 2016-7-29

发表于:2018-12-24 / 阅读(123) / 评论(0)

未知分类

科学美国人60秒 SSS Birch Trees Droop at Night with No Rays in Sight

Its easy to see that some plants change from day to nightflowers open and close, and even turn to face the sun. In 1880 Darwin noted that the leaves and seedlings of various plants appeared to engage in nighttime changes that he called sleep. But the

发表于:2018-12-24 / 阅读(174) / 评论(0)

未知分类

科学美国人60秒 SSS Ebola Virus Grew More Infectious in the Latest Epidemic

Ebola outbreaks before the most recent one have been fairly contained: geographically limited, and just a couple hundred cases. The latest outbreak, though, which started in late 2013 and lasted more than two years, was entirely different. There were

发表于:2018-12-24 / 阅读(157) / 评论(0)

未知分类