게시자 Retro Player
등록일시 2021-10-14 22:22
Why do women have periods?
View full lesson: http://ed.ted.com/lessons/why-do-women-have-periodsA handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We’…
View full lesson: http://ed.ted.com/lessons/why-do-women-have-periodsA handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We’…
