The use of a program to prove the 4-color theorem will not change mathematics - it merely demonstrates that the theorem, a challenge for a century, is a finite problem.
We are survival machines—robot vehicles blindly programmed to preserve the selfish molecules known as genes.
当市场下跌时,你轻易的将好东西打折变卖,但是一旦市场向上,再想买回来,难之又难。