科学研究   

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In nineteen fifty-nine the United States was involved in a space race with the former Soviet Union.The Soviets had surprised the world by launching the first satellite.Sputnik One was launched into or...

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Kent Redford: We in the conservation community have really been able to do almost nothing about this, except document the extinctions and the population declines. There have been some attempts ...

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If you could travel faster than the speed of light, where would you go? Mars? The nearest star system or to distant stars in far galaxies? Does faster-than-light travel have its limits? This is WHA...

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Kent Redford: No, it’s not going to be exactly the same bat, but there are going to be a lot of them and they're going to be alive and they're going to be continuing to behave like bats, express...

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- Maybe you've seen this warning lately. It's not good, especially for your phone's battery. And... But how hot is too hot? Action. There was only one way to find out. Put some phon...

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Our planet has seen this before. Its ice has already melted. Water levels have risen. Ocean currents have already stopped. Now, everything is coming full-circle. And we should be concer...

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Twin siblings, twin peaks, twin cities, twin planets... Two earths, one solar system. How would that work? Where would the 2nd earth be located? Is it possible for two planets to share one orbit? ...

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Julie Taboh attended one of Mr. Spencer’s special workshops near Washington, DC to learn how. Kevin: “Solid?" Client: "Yes!" Kevin: What’s the magic word again?” Client: “Abracadabra!” Kevin: "We...