Einstein field equations

Einstein’s equation in plain English:

Given a small ball of freely falling test particles initially at rest with respect to each other, the rate at which it begins to shrink is proportional to its volume times: the energy density at the center of the ball, plus the pressure in the x direction at that point, plus the pressure in the y direction, plus the pressure in the z direction.

— John Baez

2010.06.12 Saturday ACHK



An expert pianist can play notes faster than the brain can send signals to his hand. Likewise an artist, after a while, can make visual perception flow in through his eye and out through his hand as automatically as someone tapping his foot to a beat.

— Paul Graham




2010.06.12 Saturday ACHK


這段改篇自 2010 年 2 月 7 日的對話。



(LWT:但是呢 … 早睡的話,可能第二天早上仍然不能早起。結果都是沒有溫習。)





— Me@2010.06.11

2010.06.12 Saturday (c) All rights reserved by ACHK