Smile a While

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Across
  1. 3. Your mother’s brother’s only brother-in-law
  2. 5. marries many women but weds none
  3. 8. has a head and tail but no legs
  4. 10. I'm tall when young and short when old
  5. 11. starts with E, ends with E, contains one letter
  6. 13. where Friday comes before Thursday
  7. 15. not flesh nor bone,fingers & thumbs of their own
  8. 17. word becomes shorter when 2 letters are added
Down
  1. 1. can't be kept until you have given it
  2. 2. can fill a room but takes no space
  3. 4. so fragile, just saying its name, breaks it
  4. 6. can be as big as you, yet weighs nothing
  5. 7. invention allows people to see through walls
  6. 9. a large continent
  7. 12. can contain many letters
  8. 13. David's father has three sons.Snap,Crackle & ? daughter father's child,mother's child, yet no one's son.
  9. 14. belongs to you but is used more by others
  10. 16. no hands, no feet, but can reach the sky