Time Travelling with a Hamster

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Across
  1. 2. Something very old
  2. 5. Journey to past, present and future
  3. 9. Not proud or arrogant, modest
  4. 12. Any type of culture, society, etc., of a specific place, time, or group
  5. 13. Einstein's [most famous] theory of...
  6. 15. A spiritual guide
Down
  1. 1. A group of stars in space and a chocolate bar
  2. 3. To be careful
  3. 4. To be so scared that you freeze
  4. 6. Full of excitement and positivity
  5. 7. Activities you like to do in your spare time
  6. 8. A guess of what is to come
  7. 10. Furry rodent who likes to go for a spin
  8. 11. A ceremony for the dead
  9. 14. When a child is taken in by someone other than their birth parents