Horseshoe Crabs

tl;dr: Horseshoe Crab blood is now worth $15,000 a quart, due to it’s ability to coagulate very quickly when it encounters low doses of dangerous bacteria (like E. Coli); one of many genetic adaptations that have allowed them to spend the last 450 million years more or less unchanged. Therefore, is there a meaningful correlation between evolutionary success and medical usefulness?

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