在arxiv.org的advanced search上选择天体物理（astro-ph），搜索“density of chicken”，只有一个候选结果。
我也不知道什么叫每立方秒差距，但abstract有一句：
We find the most restrictive upper limit from the domains considered to be $10^{23}\ pc^{−3}$, which ruffles the feathers of long-standing astrophysics theory.
看来这abstract还真是简明扼要，答案就是 23。
为了支持TCP BBR拥塞控制算法，在编译Linux内核时应该配置好哪一条内核选项？
Google “linux tcp bbr option”，得到答案为 CONFIG_TCP_CONG_BBR。
不知道有没有人注意到“发表在今年的哪个学术会议上”这个很别扭的讲法，但题目从来没说是今年写的论文。在Google Scholar搜索“python type”，筛选今年的文章，然后……逐篇枚举。于是找到了答案Python Type Hints Are Turing Complete，发表在 ECOOP 2023上。
Google搜索 “tokyo university nobel prize”（typo应该为university of tokyo），找到了东京大学理学部的 Science Gallery，确实是个展厅。在这个展厅中展出了三个诺贝尔物理学奖奖牌，分别为：
小柴昌俊，2002，出生于1926/09/19
梶田隆章，2015，出生于1959/03/09
真锅淑郎，2021，出生于1931/09/21
经过一点对最小的梶田隆章的搜索：
He became director of the Center for Cosmic Neutrinos at the Institute for Cosmic Ray Research (ICRR) in 1999. As of 2017, he is a Principal Investigator at the Institute for the Physics and Mathematics of the Universe in Tokyo, and Director of ICRR.
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