Good Riddles

Question: If you have me, you want to share me. If you share me, you haven't got me. What am I?

Question: A man goes rock climbing and falls. But at the end of the climb, he appears to be fine. What happened?

Question: Nathan has math 4 times a week. If he has math 8:00 Monday, 9:20 on Tuesday, 10:40 on Wednesday, and 1:20 on Friday, when does Nathan have math on Thursday?

Question: Which triangle will have a larger perimeter : 3,4,5 or 3,4,7 ?

Question: Waking up I see a smile as warm as fire. Sleeping I see a gaze as cold as ice.