translation.en: A few times a year they tell their engineers, "Go for the next 24 hours and work on anything you want, as long as it's not part of your regular job.
translation.zh: 一年有几次，他们跟公司里的软件工程师说 “接下来的24个小时，去做你自己想做的事， 只要它和你每天的工作无关