We've all heard about the placebo effect but what about the nocebo effect? That's when you take something completely harmless but begin to think something harmful is happening to your body. This informative video by CGP Grey takes a deeper dive on it and reveals how some studies showed people gaining rashes from harmless injections when told side effects were rashes, people getting addicted to non-addictive pills and so forth. A fascinating discussion about our ability to fake ourselves out.