My brother is under the misconception that blood is blue. I'm not that good with explaining things, but so far I have convinced my dad that blood is red. My brother just does not believe that blood is red and not blue. What are some facts to disprove the misconception that blood is blue? I am in 9th Grade taking AP Bio and my brother is in 10th grade taking Bio, so please keep it as simple as you can. Or I can just simplify it for him 'cause he won't understand anything I will say. Also the fact that he thinks just because he's older, it means he's smarter. So what are some explanations?