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Isn't it weird that we have exactly five fingers and five toes on each hand and foot.
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Bone formation is extremely complex. Nearly all large mammals have the same exact bones in different sizes. Dogs, cats, and even bats (their wings) all have four fingers and a thumb.