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親代投資是理解性別差異起源的關鍵。

旅行是發現每個人對其他國家的看法都是錯誤的。

If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

要理解一個社會，看看它的垃圾。