Dumber Humans ?

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Across
  1. 2. extremely important or necessary
  2. 4. making you feel annoyed, disappointed, or discouraged
  3. 7. able to think quickly or intelligently in difficult situations
  4. 8. involving quiet and serious thought for a period of time
  5. 9. involved in something
Down
  1. 1. the activity of sending out programmes on television or radio
  2. 3. quick to act
  3. 5. the practical, especially industrial, use of scientific discoveries
  4. 6. feeling frightened
  5. 10. being in a state between sleeping and being awake