By Neo Zhang in links + notes — Jun 7, 2020 6/7/2020: Experiments 能做实验的问题,可以说离解决就差时间了。然而世界上有太多问题没有办法做实验:或者条件无法控制,或者失败成本太高。 This post is for paying subscribers only Subscribe now Already have an account? Sign in.