Some people take aspirin or ibuprofen to treat everyday aches and pains, but how exactly do the different classes of pain relievers work? Learn about the basic physiology of how humans experience pain, and the mechanics of the medicines we've invented to block or circumvent that discomfort.
What happens when you can’t feel pain? http://science.howstuffworks.com/environmental/life/human-biology/cipa.htm
Is pain all in your mind? http://www.youtube.com/watch?v=-3NmTE-fJSo
The Human Nervous System (Chapter 30) http://www.sciencedirect.com/science/book/9780125476263#ancS1
The Induction of Pain http://www.ncbi.nlm.nih.gov/pubmed/9987804
George Zaidan's other TED-Ed lesson: How do cancer cells grow? How does chemotherapy fight cancer (and cause negative side effects)? The answers lie in cell division. George Zaidan explains how rapid cell division is cancer’s "strength" -- and also its weakness. http://ed.ted.com/lessons/how-do-cancer-cells-behave-differently-from-healthy-ones-george-zaidan