My son was doing OK, not too good and not too bad. 2016 can then

来源: 于 2011-02-09 07:43:57 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

My son was doing OK, not too good and not too bad.

2016 can then do USAPHO in high school. Every year, half million kids participate in AMC, and only 3 or 4 thousand kids do physics competition.