Complete to know your destination

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Across
  1. 3. Secret UM Order, recently disbanded
  2. 5. "No," in Nuremburg
  3. 6. "Night of the ___" zombie series
  4. 9. Loss of senescence can lead to this
  5. 11. Theta, in the Greek alphabet
  6. 12. i.e. memes of dogs, cats or other pets that make you happy
  7. 13. "No ___!" Campaign promise
Down
  1. 1. H-bonding compound with a buzz
  2. 2. goal of vaccines, on a cellular level
  3. 4. Salutation, formally
  4. 7. Hippocrates' oath, summarized
  5. 8. number in a Throuple
  6. 10. Darwin's discovery, verb