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

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

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

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

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

科学美国人60秒 SSS 2016-7-20

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科学美国人60秒 SSS 2016-7-21

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科学美国人60秒 SSS 2016-7-22

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科学美国人60秒 SSS 2016-7-25

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科学美国人60秒 SSS 2016-7-26

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科学美国人60秒 SSS 2016-7-27

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科学美国人60秒 SSS 2016-7-28

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科学美国人60秒 SSS 2016-7-29

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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

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

科学美国人60秒 SSS NIH Director Looks at Presidential Transition

As somebody who is part of the executive branch and serving in this role which I can consider to be a great privilege, as director of NIH, I am confident that the convictions that are held by many Americans and by most members of the Congress, that b

科学美国人60秒 SSS Police Body Cameras Appear to Moderate Interactions with Civilians

The last few years have seen numerous widely publicized incidents of civilians, black men in particular, being killed by police. In response, many officers are now required to wear body cameras. The theory is that technology will lessen the likelihoo

科学美国人60秒 SSS DNA Samples Find a Lot of Fish in the Sea

The way we sample much of the world's oceans, to see what's living down there, is pretty basic: Ask fishermen. Or just stick a net down there, and examine what we catch. Neither method is ideal. Because you basically catch the fish and kill them. Phi

科学美国人60秒 SSS Forest Die-Offs Alter Global Climate 'Like El Nino'

Climate change may be partly to blame for the massive die-off of pine trees in the western U.S. But it works the other way, too: forest die-offs can alter the global climate. I like thinking of this as a parallel to something like El Nino. Abigail Sw

科学美国人60秒 SSS High Fiber Diet Keeps Intestinal Walls Intact

Your nose may be the first place you think of as a source of mucus. But mucus is a major player in your gut, too. There's antimicrobial peptides and proteins that are present in there. Bacteria live in there and forage on the carbohydrates. And it's