"Reading is the most important skill a child can learn."

一个奇怪的事实是，根据是从生物学还是地球物理学的角度来探讨问题，关于地球史前条件的结论完全相反，这反映了我们目前知识的不完整状态。

Simplicity is the ultimate sophistication.

You cannot teach a man anything, you can only help him to find it for himself.

可持续性不是一种趋势；而是我们对地球和未来农民的责任。