https://blog.wongcw.com/2021/01/21/gabe-newell%e9%80%8f%e9%9c%b2valve%e6%9c%89%e5%a4%9a%e6%ac%be%e9%81%8a%e6%88%b2%e6%ad%a3%e5%9c%a8%e9%96%8b%e7%99%bc%e4%b8%ad/