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Where will humans & animals be in 20 years? Listen for If you liv... -
Hank tells us about the team of deadly ninja assassins that is tasked with protecting our bodies from all the bad guys that want to kill us - also known as our immune system. Crash Course Biology is now available on DVD! http://dft.ba/-8bCC Like CrashC... -
You probably don't think twice about getting vaccines, after all, they're supposed to help you prevent disease and promote health, right? Dr. Sherri Tenpenny discusses some things you probably didn't know about what is actually getting injected into...