@overhtmoon520 @NathanpmYoung @ESYudkowsky @slatestarcodex @eigenrobot @s8mb @robertwiblin @willmacaskill @moskov The reason for this is that taking care of 2*n children takes less than twice the effort of taking care of n children.
They can share resources, entertain each other, etc.
(I have two sisters ~15y younger than myself so this comes in part from personal experience)

@overhtmoon520@NathanpmYoung@ESYudkowsky@slatestarcodex@eigenrobot@s8mb@robertwiblin@Willmacakill@moskov之所以如此，是因为照顾2*n个孩子所需的工作量不到照顾n个孩子的两倍。
他们可以共享资源、相互娱乐等。
（我有两个妹妹，比我小15岁左右，这部分是因为我的亲身经历）