Conference Crossword

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Across
  1. 4. Post-conference dinner spot
  2. 5. Common medium of science art
  3. 9. Count of hydrogen "siblings"
  4. 10. Same same, but different
  5. 11. A star's favorite pastime
  6. 12. What we all need
Down
  1. 1. Fuel of academics
  2. 2. Conference timekeeper
  3. 3. Tally of invited minds
  4. 5. Always positive :)
  5. 6. Spokesperson of RTG 2721
  6. 7. Host city
  7. 8. Element of the hour!