I am having too much fun

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Across
  1. 3. GATTACA
  2. 4. Gut culture
  3. 5. Hot stopping or computer script? Up to you
  4. 7. "HP and the _______ of Secrets"
Down
  1. 1. O=O=O
  2. 2. Hot, scary, coughing
  3. 6. Not under-y, but...