Number 1

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Across
  1. 4. One of Broadway's hottest musicals, first treasury secretary of the USA
  2. 8. The centre of Renaissance, city
  3. 9. The only opera by Mozart to have premiered in Prague (no space)
  4. 10. The big apple (no space)
  5. 11. One of the most influential psychologist in present day, author of lobster theory in relation to humans
  6. 12. One of the world's greatest inventors/Elon Musk's company (surname)
Down
  1. 1. Song beginning with these tones E, D#, E, D#, E, B, D, C, A (no space)
  2. 2. American sport played on a diamond-shaped pitch
  3. 3. The second person in history to ever step on the Moon
  4. 5. Egyptian queen of stunning beauty and substantial wit
  5. 6. Your teddybear
  6. 7. Founder of Western philosophy, "True knowledge exists in knowing that you know nothing"