The genius of invention

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Across
  1. 4. Synonym for "old-fashioned" but more familiar.
  2. 6. An invention that massively killed people at the end of World War II.
  3. 7. Platforms or applications like Deezer, Spotify or Netflix.
  4. 8. Clavier.
  5. 10. Contrary for "useless".
  6. 12. Plomb.
Down
  1. 1. Thomas Edison's invention.
  2. 2. Substances toxiques.
  3. 3. Facebook, Snapchat and Twitter are...
  4. 5. Something you use to visit a website (like Chrome, Firefox...)
  5. 9. Télécharger.
  6. 11. Modal used to give advice.