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SSS 2011-02-01

This is Scientific Americans 60-Second Science. Im John Matson, Got a minute? Imagine a pinball machine on multi-ball modeonly the balls are the size of planets. The early solar system was such a rough-and-tumble place. That chaotic environment produ

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Scientific American(二)月

2006年VOA标准英语-Pluto Demoted, No Longer a Planet

By Patricia Nunan in Kantale, Sri Lanka 24 August 2006 As many as 170,000 people in northern and eastern Sri Lanka have been displaced in recent weeks by fighting between the Tamil Tiger rebels and government forces. VOA's Patricia Nunan recently me

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2006年VOA标准英语（八月）

2006年VOA标准英语-Astronomers Discover Two Moons Orbiting Pl

By Jessica Berman Washington 22 February 2006 U.S. astronomers have discovered two moons orbiting Pluto, an icy planet smaller than our moon. Scientists found the moons while surveying the sky as part

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Who Was Sacagawen 萨卡加维亚 Chapter 2

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名人认知系列 Who Was

Who Was Sacagawen 萨卡加维亚 Chapter 1

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名人认知系列 Who Was

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名人认知系列 Who Was

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