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🙃
Also, here’s a decent video on wheels not actually being all the rave throughout human history either: https://tube.kockatoo.org/w/82758fd3-6e61-42a9-80c7-462639cfc608
TL;DW: Waterways were preferred, if available. And the use of wheels requires stable ground, but also required draft animals until really not too long ago, so lots of folks just skipped the wheeled cart and strapped their goods directly to the draft animal.
Among animals, there exists a single known example of an apparently freely rotating structure, though it is used for digestion rather than propulsion: the crystalline style of certain bivalves and gastropods.[19]: 89 The style consists of a transparent glycoprotein rod which is continuously formed in a cilia-lined sac and extends into the stomach. The cilia rotate the rod, so that it becomes wrapped in strands of mucus. As the rod slowly dissolves in the stomach, it releases digestive enzymes.[19] Estimates of the speed of rotation of the style in vivo vary significantly, and it is unclear if the style is rotated continuously or intermittently.[20]
Weird, kinda gross, and fascinating!
Yes, I study bivalves actually and it is utterly fascinating. I remember I learned about it rotating only after a few years of study and it blew my mind
And if my mom had wheels she’d be a bicycle
Well, everyone’s had a ride
