Our blood is blue before it comes into contact with oxygen.
The truth: Some people get confused when they see through their skin that their veins are a blue color. This is just an optical illusion and not proof that some of the blood inside our bodies doesn’t contain any oxygen. In reality, blood remains dark red inside our veins and turns a cherry red when it meets oxygen. And this is thanks to a compound called heme which is responsible for transferring blood throughout our bodies.
I fell asleep on the front row of a Mettalica concert!