Questions # 38, 39, 40, 41

Hello! Sorry I haven't posted in a while!

38: If we evolved from apes, and lost the body fur on the way, who do we still have hair on our head? What is the point?

39: Where did the question "How many monkeys does it take to fix a light bulb" originate from?

40: People say that drowning is a peaceful way to die. How do they know? Obviously they didn't die...

41: Lie both hands flat in front of you. With the left hand, stick out your thumb and tuck all other fingers back. With your right hand, tuck all fingers back except for your pointer finger. Stick it out so it looks like your pointing at someone. Now switch. Why am I the only one who can do this easily? (does this make sense)