FUNDAMENTAL PHYSICS CROSSWORD

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Across
  1. 1. The force everybody knows but nobody understands (7)
  2. 5. Our common home (8)
  3. 6. Quark (3)
  4. 7. Invisible stuff making up most of the universe's mass (4, 6)
  5. 9. Ghostly particle that goes through most things (8)
  6. 10. Behemoth smasher of protons on Swiss-French border (3)
  7. 12. Step 1 of apple pie recipe? (3, 4)
  8. 14. The last discovered elementary particle (5, 5)
Down
  1. 2. Don't touch this in case you annihilate! (10)
  2. 3. Quark (7)
  3. 4. Nature's fundamental barrier (5, 2, 5)
  4. 5. Quark (2)
  5. 8. Quark (4)
  6. 11. Quark (5)
  7. 12. Don't fall into this if you want to get back out! (5, 4)
  8. 13. Quark (6)