Rich's 60th Birthday

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Across
  1. 2. Chatting Noggins
  2. 3. Who let a ____ in here?
  3. 4. Lacking originality, or something to calculate
  4. 7. A boundary, or the behavior of a function as it approaches a value
  5. 9. Best candy
  6. 12. What you might be using to fill this out
  7. 15. America runs
  8. 17. I like my coffee
  9. 18. Feature of a TI-84
  10. 19. 2005 Vehicle
  11. 21. Below average, in a good way
Down
  1. 1. Goof Spout
  2. 3. 2:30 works great!
  3. 5. Son of a
  4. 6. Your worst enemy
  5. 8. Stranger Things Chief
  6. 10. What am I?
  7. 11. A game of money
  8. 13. A good spot for a ring
  9. 14. I don't give a
  10. 16. Essential, or the area under a curve
  11. 20. 3.1415?