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Reference books: The mystery surrounding the number of males and females https://amzn.to/3zwQrmK Why do marine creatures show diverse sexuality? https://amzn.to/3XTPC1w ↓I published a book: "Scary science encyclopedia that they don't teach you in school" https://amzn.to/48ft4v4 ↓Twitter / rui_science ↓Channel membership / @ruiscience BGM [Touhou] Tomboy Love Girl [Original arrangement] Heartwarming Waltz [Recorder] Kuzuki Town Nico Nico Commons https://commons.nicovideo.jp/