Good Riddles

Question: You can easily touch me, but not see me.
You can throw me out, but not away.

What am I?

Question: There are 100 coins scattered in a dark room. 90 have heads facing up and 10 are facing tails up. You cannot tell which coins are which. How do you sort the coins into two piles that contain the same number of tails up coins?

Question: What jumps when it walks and sits when it stands?

Question: Say you roll five dice and get a one, a two, a three, a four, and a five. Your sum would be six. Rolling all threes would give ten. Rolling a two, four, two, four, and six would be zero. Rolling a two, three, four, five, and six would be six.

What would you get if you roll a three, a four, a one, a five, and a four?

Question: Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, my greedy lust devours them all.

What am I?