I am sorry, I didn't know exactly where to put this. I do believe it has to do with physics but I am not completely sure, so I hope it's OK to place the thread here. If not, I apologize greatly. I had a discussion at school about swimming in various liquids. I came to the conclusion that it is more difficult to swim in blood than in water, because of the density of the blood - because it's thicker than water. However, my theory was questioned by others, some which claimed that it was in fact easier to swim in blood than in water. Question is - is it more difficult to swim in blood? Is it possible to stay afloat in blood? Why and/or why not? How can I understand the answer this by using simple physic? Thank you! PS: Tried to google without any success.