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(Intro music) Alright, you ready for a joke? A man walks into a bar. Ouch. Normally the joke ends there, if you could call that a joke. We here at SciShow take our puns very seriously, and canamp;#39;t help but wonder what happens to that guy after he whacks his head into the bar. Well, he probably ends up with a bruise which goes through a rainbow of colors over the next several days. Using the power of science we could make some educated guesses about how exactly those colors will progress, and why. When you get a bruise itamp;#39;s because you banged yourself hard enough to break capillaries Those tiny little blood vessels that are everywhere inside your body. After they break, the blood leaks outside of the capillaries which is why bruises tend to be reddish at first. Itamp;#39;s because of red iron, carrying hemoglobin, which is what your blood uses to cart oxygen around your body. All those other colors like, blue and green and yellow and brown show up as the body breaks down
