One of the most valuable “blue liquids” on Earth isn’t a luxury chemical — it’s horseshoe crab blood, and it can cost up to $60,000 per gallon. Horseshoe crabs have bright blue blood because it uses copper-based hemocyanin instead of iron-based hemoglobin. But what makes it priceless is a substance inside it called Limulus Amebocyte Lysate (LAL), which can instantly detect deadly bacterial toxins. Pharmaceutical companies rely on LAL to test vaccines, IV fluids, surgical implants, and medical de

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