Oh man I really wanted to hear tons more about blood. … I can’t stand the sight of it truth be told, but it seems to me like the most interesting and precious. Sorta like all the organs being just parts/components of the machine, but the blood is the special sauce or ingredient. And the fact that there are different types is also very strange to me. Strange that after all this time within evolution there isn’t just one type. Why is it that We still see different types of blood? I just feel like it would be more effective and efficient, evolutionarily speaking, for there to be less variation. Idk