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科学美国人60秒 SSS 抱住大星系的大腿
Our galactic home, the Milky Way, is big. Mostgalaxies are far smaller. And its not easy being one of those little galaxiesa big galaxys gravity can rob their gas. And gas creates new stars, so losing gas spells the end of star-making. That's what ha
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科学美国人60秒 SSS 大爱发酵食品
There are sort of three main ways that our species has developed to break down foods, or process foods, in a primordial way. And that is by cooking,by fermenting foods and by drying them or desiccating them. 我们人类有三种分解食物或处理食
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科学美国人60秒 SSS 红细胞可“记住”并适应高海拔
Head to the mountains, and if the steep trails don't slow you down, the thin air will. There's less oxygen up thereso strenuous activity can leave you dizzy, out of breathor worse. But even though you're beat, biochemical processes are already busy a
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科学美国人60秒 SSS The Arctic's Anti-Snowball Snowball Effect
Last Christmas, Santa Claus must have been loading his sleigh in a t-shirt and shorts. Temperatures at the North Pole crept up toward the freezing point when they should have been minus twenty Fahrenheit. The heat wave was the latest in a series that
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科学美国人60秒 SSS Widening the Suez Canal Ushers In Underwater Invaders
The Mediterranean Sea is home to some 17,000 native species. But it's also home to a growing number of non-native species: 756 at last count. 756 may not sound like a lot, compared to 17,000. But this is not arithmetic. Bella Galil, a naturalist at I
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科学美国人60秒 SSS Super Bowl Snacks Need These Exercise Equivalents
Super Bowl Sunday is almost here and theres one question on everyones mind: How can I tackle a plate of chicken wings without adding yardage to my end zone? Well, Charles Platkin is the director of the New York City Food Policy Center at Hunter Colle
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科学美国人60秒 SSS Frog Spit Behaves Like Bug-Catching Ketchup
You might think frogs catch insects cause their tongues are sticky. But why is the tongue sticky, and how does it actually adhere to these insects at these very high accelerations? Those are the questions Alexis Noel, a PhD candidate in mechanical en
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科学美国人60秒 SSS Gulf Dead Zone Makes for Shrimpier Shrimp
Every spring, the Mississippi River dumps tens of thousands of tons of nutrient runoff into the Gulf of Mexico. Add temperature, current and wind to that pollution, and you have the Western Hemisphere's largest stretch of oxygen-poor watersa so-calle
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科学美国人60秒 SSS Partnered-Up Men More Attractive to Women
It turns out the best looking thing on a man may be a good-looking woman. Researchers report that women find a man they see with an attractive woman more desirable than unattached men. Thats according to a study in the journal Evolutionary Psychology
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科学美国人60秒 SSS Cool Coating Chills in Sunlight
You've probably seen pictures of Greek villages, where every house is painted bright white. The paint reflects the intense sunlight of the Mediterranean. And it works pretty well to keep the houses from heating up in the sun. But it doesn't actively
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科学美国人60秒 SSS Housing Boom Busts Birds' Valentine's Day
Urban development is encroaching on forests in the Pacific Northwest. And its also ruining Valentines Day for some songbirds. Because urban growth is making it a challenge for some birds like the Pacific Wren to stay faithful to their partners, at le
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科学美国人60秒 SSS Heat Sensor Has Snaky Sensitivity
One of the most exquisite heat sensors in the worldits not in some government lab. It's in the head of a snake. The pit viper, to be specific. They're incredibly sensitive. They beat any of the synthetic counterparts, even the most expensive semicond
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科学美国人60秒 SSS The True ＂Bottom＂ of the Food Chain Is Plenty Polluted
The Mariana Trench is the deepest spot in the worlds oceans. Only three humans have ventured into the trench in submersibles. But plenty of our pollution has made the voyage to the bottom of the sea: a new study finds that critters living more than s
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科学美国人60秒 SSS Two Words Trigger CDC To Stay Quiet
CDC is afraid is afraid to fund firearms research. David Hemenway, professor of health policy at the Harvard T.H. Chan School of Public Health. Twenty years ago they were doing a tiny amount of funding for firearms research, $2.6 million a year, $2.6
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科学美国人60秒 SSS Spaceflight Squishes Spacefarers' Brains
Time spent in zero G changes the body: Astronauts come home with bone loss and muscle weakness. But what happens in their heads? To find out, researchers examined MRIs of astronauts brains taken before and after flight. They looked at 12 astronauts w
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