Two: the inside and the outside (badum tshh)! But taking a more scientific approach, do bananas actually have 5 sides like all the pub quizzes say?

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Dr Sally Le Page is a British evolutionary biologist and science YouTuber. The aim of these videos is to bring science further into popular culture by making science videos that make you laugh, make you feel and make you think.

References:
Fahn (1953) The Origin Of the Banana Inflorescence
https://www.jstor.org/stable/4115516
Interactive Voronoi Diagram Generator:
http://alexbeutel.com/webgl/voronoi.html

Both included with permission from the copyright holders.