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Blood clotting video.

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Science Buddies Original
Science Fair Project Idea
Have you ever had a cut or a bloody nose that seemed like it would bleed forever? Though it might have seemed like a long time, it probably did stop pretty quickly. This is because different factors in a person's blood normally work together to plug the opening caused by the cut in a process called blood clotting or coagulation. However, some people have a genetic disorder called hemophilia that causes them to bleed excessively. If a person has hemophilia, he or she is usually missing some of… Read more
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Time Required Very Short (≤ 1 day)
Tinkering
Prerequisites None
Material Availability Specific chemicals (sodium citrate, sodium alginate, and calcium chloride) are needed. A kit containing these chemicals is available from our partner Home Science Tools. See the Materials section for details.
Cost Low ($20 - $50)
Safety Adult supervision may be needed for using a blender. All chemicals in this science project are safe to use (they are common food additives).
Free science fair projects.