Good Riddles

Question: You need a room for your group. Each person needs 5 square feet of space. You have 25 people in your group, what is the smallest room you can use?

Question: How do you run around your block 10 times without breathing heavily?

Question: What glass protects you from the sun but does not lets you see near?

Question: I can pogo on the moon, but not Mars. I can pogo on this table, but not on a stick. What can assure us to be able to pogo on objects at all times?

Question: what comes up but never goes down