A second power keeping you engaged is your brain's proven love of authenticity.

第二，让你保持专注的力量是你的大脑对真实的热爱。

So you take the square root of the variance, you get the standard deviation, that's why I got rid of that to the second power.

所以你取方差的平方根，你得到标准差， 这就是为什么我把它去掉到二次方。