1. If our blood is red, why are our veins blue?
No matter what people try to tell you, our blood is always red. So why do our veins look blue? It's because there are different wavelengths with different properties hitting our arm when we look at it. The blue light just happens to be absorbed by the blood and make it back to your eye.
2. Why does turkey make you tired?
The answer: it doesn't. Contrary to popular belief, it's not the tryptophan (an amino acid that makes up the brain chemicals that make you tired) in the turkey that makes you sleepy. It's actually the sheer amount of food and beverage you've consumed during your holiday meal.