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Black people can (generally) run faster and jump higher than most white people. Someone told me it is because their calves are structurally different. Is there any truth to this?

For an experiment I need to be able to vary the level of coagulation in a sample of pig blood. What are some effective agents that I can use to coagulate and decoagulate the blood? It would be helpful if the chemicals are easily obtained and relatively inexpensive.