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What Dinosaurs, Pyramids, and the Atomic Bomb Have in Common
AI摘要
这个引人入胜的科学视频讲述了物理学家路易斯·阿尔瓦雷斯的故事——他参与了曼哈顿计划,用缪子扫描埃及金字塔,还帮助证明了小行星导致恐龙灭绝。学习者将接触到丰富的学术词汇,包括'nuclear chain reaction(核链式反应)'、'implosion(内爆)'、'muons(缪子)'、'iridium(铱)'和'mass extinction(大灭绝)'。非常适合在科学史和跨学科主题中提升英语能力。
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下载Sometimes, being an expert in one scientific field does not translate to another.
The ability to design a nuclear reactor doesn’t make you qualified to dish out health advice… unless that advice is to avoid eating uranium.
But if you’re particularly clever, you might find yourself making headlines for discoveries in multiple scientific fields.
And today, we’re going to talk about one such scientist: a particle physicist named Luis Alvarez, who investigated everything from atomic bombs, to Egyptian pyramids, to what actually killed the dinosaurs.
[♪INTRO]
Luis Alvarez was born in 1911, which put him in a great position to contribute to the newfangled field of particle physics.
For example, that was the same year that Ernest Rutherford proposed an updated concept of an atom, where most of its mass is concentrated in a small, compact nucleus.
But it was also two decades before we knew that nuclei didn’t just have protons in them, but neutrons, too.
Alvarez got a PhD in physics from the University of Chicago before heading to UC Berkeley’s Radiation Laboratory.
And like any good scientist, he was constantly trying out new things and experimenting.
So it’s no surprise that he was soon pulled into one of the biggest science experiments in history.
Life comes at you fast, and so did World War II.
Alvarez started off working in the microwave radar space.
But eventually, he wound up at the hottest place for scientists in the early 1940s: Los Alamos, New Mexico.
Working on …you guessed it… The Manhattan Project.
You probably remember from history class… or the movie Oppenheimer… that the U.S. dropped two nuclear bombs on Japan.
But you might not remember that they were fundamentally different pieces of tech.
Little Boy was a gun-type bomb powered by the element uranium.
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你是一个好人。(You are a good person.)
核心家庭是指由父母和子女组成的家庭单位。
指进行体力或脑力活动以完成任务、生产商品或提供服务。
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