All About Allergies

What are allergies? How are they caused, and what can people do to prevent them? SciShow explains!

Hosted by: Michael Aranda

Annotations:
Your Immune System: Natural Born Killer:    • Your Immune System: Natural Born Kill...  
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Sources:
http://pennstatehershey.adam.com/cont...
https://www.aafa.org/display.cfm?id=8...
http://www.rsc.org/chemistryworld/pod...
http://health.howstuffworks.com/disea...