Short Riddles and Answers

Question: You have a flashlight that takes 2 working batteries. You have 8 batteries but only 4 of them work.

What is the fewest number of pairs you need to test to guarantee you can get the flashlight on?

Question: The 22nd and 24th Presidents had the same biological mother and father, but weren't brothers. They were both male, and were never female. Neither were adopted or "switched at birth". How is this possible?

Question: Farrah left her key under the mat and when she came back she lost it.The painter said he painted the wall ,the security said she didn't know, annd the janitor said he cleaned the floor. Who took the key?

Question: I have more shoes than anybody,
but less feet than everyone.
I am met in the morning,
but departed in the night.
I may shake as if I'm angry,
but I won't bite.

What am I?

Question: i am the most powerful force in the universe, u cannot see or feel me, but i can be seen in ones actions, i have nothing to do with religion. Everyone has some of me, but nobody has all of me, what am i...