Uhm Physics

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Across
  1. 4. the original
  2. 6. her
  3. 8. never look back
  4. 9. "I'll just have to do it by-"
Down
  1. 1. only a constant by our human perspective
  2. 2. the thickness of your lunula
  3. 3. it'll show up at the end
  4. 5. of apple fame
  5. 7. often confused with weight