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They don't to most people. That's just your subconscious making its desires known.
Furthermore, how does your body know when to stop growing? Why did your finger stop growing where it did, rather than being a foot long or stumped at the knuckle? Why does the liver regenerate whilst other body parts don’t? Why do children’s fingertips regrow if cut off but this ability stops after a few years?
As identical cells multiply and grow into animal bodies’ amazing anatomy, we usually think it's molecules dictating complexity. But what if the cells themselves show intelligence - shared goals and skills enabling their incredible cooperation? This radically different idea comes from pioneering developmental biologist Mike Levin's fascinating research frontier.
I found an awesome website and YouTube channel with excellent videos of various systems of biology particularly in the human body. These videos are organized into subject areas.
The videos can be found at http://armandoh.org/subjects/
The YouTube channel is here.
I suggest watching the videos in order for a particular subject. One of the videos I watched and like a lot is about the neuron and is shown below. It is part of the Neurology series.
www.youtube.com/embed/FVo04B0_5R4