Riddle #131

Question: If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?

Question: What kinds of balls do dragons play soccer with?

Question: What can be broken but never forgotten?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: What tastes better than it smells?

Question: What loses its head in the morning and gets it back at night?