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I have a sunburn. Why is there a 3-5 second delay between the moment I scratch it and the moment I feel pain?

1039 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
I have a sunburn. Why is there a 3-5 second delay between the moment I scratch it and the moment I feel pain?	1039
Is there an reason more species have not evolved omnidirectional vision?	1