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科学美国人60秒 SSS 未来太空三种战略趋势
Air Force Tracks Final Frontier 未来太空三种战略趋势 Theres three strategic trends that I see in space. 我在太空中看到了三种战略趋势。 General Jay Raymond, Commander of Air Force Space Command in Colorado Springs. He recently
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科学美国人60秒 SSS 2017你旅行了5.84亿英里!
You Traveled Far Last Year Happy New Year! And if youve been away from work for a few days, you deserve some time off. After all, youve traveled far. Even if you just stayed at home. According to NASA, just by being on the planet Earth in the last ye
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科学美国人60秒 SSS 我们的身体并不是晴雨表
Pain and Weather Fail to Connect Are you one of those people who can tell when a storm is approaching based on your achy knees? Well, you may think you are. But a new study of more than 1.5 million seniors finds no relationship between rainfall and d
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科学美国人60秒 SSS 疲劳驾驶危害大
It's particularly concerning that 56 million Americans a month admit that they drive when they haven't gotten enough sleep and they are exhausted.Charles Czeisler. Hes the director of the Division of Sleep Medicine at Harvard Medical School. 需要特别
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科学美国人60秒 SSS 鸟类唱歌导师很重要
Finches Can Learn to Sing Differently Than Their Genetics Dictate In the most recent podcast we discussed how baby bats learn their callsfrom all the other bats in their crowded colonies. And we mentioned in passing that songbirds usually get tutored
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科学美国人60秒 SSS 蝙蝠的叫声传递了感情
When we humans talk to other humans, the soundswe make all have very specific meanings. When Isay apple you immediately imagine something thathas the characteristics of an apple. Yossi Yovel, aneuroecologist at Tel Aviv University in Israel. Andthe q
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科学美国人60秒 SSS 海狸牙齿的奥秘
Ah yes.The ol' fluoride rinse at the dentist. Not pleasant. But hey, good for your teeth, right? 没错，这是牙医洗牙用的含氟漱口水。确实够闹心的。但毕竟对你的牙齿有益不是吗? Well now materials scientists have been
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科学美国人60秒 SSS 哪一个先长出来：长鼻还是花?v
Which Came First: The Proboscis or the Flower? To learn about the plant life of long ago, scientists dig through layers of the Earth, looking for fossil clues. Like bits of fossilized pollen, or spores.And that's where I come in. Timo van Eldijk (EL-
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科学美国人60秒 SSS 奇怪的太阳系
You Live In a Strange Solar System The more astronomers study the heavens, the more they realize: our solar system is weird.There are a few things that make the solar system kind of strange.Lauren Weiss, an astrophysicist at the University of Montrea
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科学美国人60秒 SSS 放射可以帮助心脏恢复节奏
Radiation Might Help Heart Regain its Rhythm That beeping sound is the normal beating of a heart. But here's what the same heart sounds like, during a bout of ventricular tachycardia, or VT the racing beats are caused by an electrical short circuit i
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科学美国人60秒 SSS 蝙蝠回声定位
Just as humans understand the shape of oursurroundings by how light reflects off objects, batsuse reflections of sounds they produce insteadwhat's called echolocation. But despite theirexcellent sensing abilities, one type of obstaclevexes the animal
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科学美国人60秒 SSS 小蝙蝠能学会不同的方言
Baby Bats Can Learn Different Dialects Bats are sophisticated communicators. And not just when theyre in vampire form. New research finds that Egyptian fruit bats actually have regional dialects, depending on the bat chatter that surrounds them as th
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科学美国人60秒 SSS 动物也喜欢荧光棒
Populations of frogs, salamanders and other amphibians are declining around the worldeven in protected areas, like U.S. national parks. Ecologists needed a simple method to track the animals numbers. Now, researchers have found an effective way to ke
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科学美国人60秒 SSS 生人难近
Small, tasty mammals like dwarf mongooses have one main goal: do not get eaten. So the animala type of weaselhas a surveillance system. While most of the group focuses on finding food, a handful of others watch for predators. They take turns so that
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科学美国人60秒 SSS 水下的统治者到底是谁
Sharks Rule the Reef's Underwater Food Chain Predators like wolves affect their ecosystems by eating their prey. But a more subtle impact involves fear. Predators also terrify prey species. And when, for example, elk are hiding, they don't spend as m
