Testing a Light Switch - Search Videos

This Blue Blood Could Save Your Life

YouTubeCleo Abram

This Blue Blood Could Save Your Life

This blue stuff is actually blood and it’s probably saved your life! It’s from a horseshoe crab and it’s really effective at testing human vaccines for contamination. If a clot shows up in testing, that means it’s not safe and scientists destroy the batch so it never ends up in YOU! The problem is, collecting horseshoe crab blood isn ...

2.5M views3 weeks ago

Light switch How to Install

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Tiny But Bright! The Smallest DIY Flashlight Ever!

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