Why watch
毕的二阶导 (the “second derivative”) answers small science questions with big, obsessively researched videos: why the sea is blue, argued through two Nobel laureates' famous quarrel, is a typical subject. Short, punchy and genuinely rigorous — his most-viewed video has passed eleven million views.
What to expect
- Chinese narration; the visuals and diagrams help, but the humor is in the words.
- Chinese-led narration; try browser translation or subtitles where available.
- Subtitle availability can vary by video — browser page translation works well for titles and comments.
New here?
If this label feels intimidating, start with our guide to watching Bilibili in English or pick something from the Visual-first shelf instead.