Recommend 3blue1brown

22 sec read

When I was in high school and saw the following equation, my mind was blown!

Why is Pi here? Isn’t it supposed to show up only in circle related problem? But the left-hand has nothing to do with circle. And it’s Pi squared!

Even today I still do not have an intuitive understanding why the above equation is true, until I watched a visual explanation from 3blue1brown. This video provide an elegant and visual proof of the equation. Go ahead and watch it:

The link is:


今天无意中看了崔永元和水均益的女儿水亦诗唱的《请跟我来》,很感动。已经记不清什么时候第一次听这首歌,但是这简单的旋律、崔永元浑厚和水亦诗纯洁的嗓音,一下子把我带到青春的过去。我感觉心好像融化一般,眼泪也不由地流了下来。 点击下面Youtube的链接可以欣赏他们的演唱。后面是歌词。朴素的歌词,却总有打动人心的力量。 请跟我来 作曲:梁弘志 编曲:钟兴民 填词:梁弘志 主唱:苏芮–虞戡平 歌词: 我踩着不变的步伐 是为了配合你到来 在慌张迟疑的时候 请跟我来 我带着梦幻的期待 是无法按捺的情怀 在你不注意的时候 请跟我来 别说什么 那是你无法预知的世界 别说你不用说 你的眼睛已经告诉了我 当春雨飘呀飘的飘在 你滴也滴不完的发梢 戴着你的水晶珠链 请跟我来
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