任何经济理论的最终检验标准是它是否能改善现实世界的决策。

The greatest threat to our forests is not the axe, but indifference.

The best way to untangle a knotty tangle is not to “untie” the knots， but to keep pulling the loops apart wider and wider. Just make the mess as big， loose and open as possible. As you open up the knots they will unravel themselves. Works on cords， strings， hoses， yarns， or electronic cables.