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This is Scientific American's 60-Second Science. I'm Sophie Bushwick. Got a minute? The shortest distance between two points may be a straight line, but try telling that to electrons: when current flows down a wire, these particles zig and zag, movin
核心句型: I never leave it down to the wire. 我从来不会等到最后一刻才开始做事。 down to the wire中的wire指的是赛马跑道拉的终点线,在赛马比赛中有时直到冲过终点线的那一刻才能定胜负。这个短
By analyzing different samples of lava, Herrero / Bervera has built up a picture of how the filed has changed since long before humans were around. They are actually the recorders of the Earth's magnetic field in hundreds of years, thousands of years
But heres a mystery: When you press pause on the VCR, the screen doesnt go blank. Instead, you get a frozen image. Remember, you need a changing magnetic signal to create even a still video image. If the video tape isnt moving, where is this changing
Although audio tapes and video tapes look different, theyre based on the same principles. Each has a roll of magnetic material which slides past the so-called playback head in the VCR or cassette deck (cassette decks have one playback head, VCRs have
听力文本 Recording 30 录音30 1. We've recently been doing some research involving mice. We were trying to find out what causes the cells in our body to age. 1、我们最近在做一些和老鼠有关的研究。我们尝试找出我们体内的细