Every night at 7: 00. According to Zhihu's introduction page, the hail in summer is broadcast live in Zhihu at 7: 00 every night. Zhihu, an original content platform for high-quality Q&A communities and Chinese Internet creators, was officially launched in June 20 1 1, with the brand mission of "let people better share their knowledge, experience and opinions and find their own answers". Zhihu has a serious, professional and friendly community atmosphere, unique product mechanism, structured and accessible high-quality content.