Why Time Only Flows Forward

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Across
  1. 5. Relating to quantum theory, which describes the behavior of matter and energy at the atomic and subatomic levels.
  2. 8. The indefinite continued progress of existence and events in the past, present, and future regarded as a whole.
  3. 9. The branch of physics that deals with heat and its relation to other forms of energy and work.
  4. 12. Impossible to reverse; not able to be turned the other way or back.
  5. 13. A long or arduous search for something.
  6. 15. The likelihood of something happening or being the case.
  7. 16. Existing or occurring at the beginning.
  8. 17. A course along which someone or something moves or lies.
  9. 20. Relating to the mind or mental processes.
Down
  1. 1. Relating to the origin and development of the universe.
  2. 2. Able to be turned the other way or back.
  3. 3. A person or thing that is mysterious, puzzling, or difficult to understand.
  4. 4. All existing matter and space considered as a whole; the cosmos.
  5. 6. The faculty by which the mind stores and remembers information.
  6. 7. The ability to see, hear, or become aware of something through the senses.
  7. 10. In the direction that one is facing or traveling; onward.
  8. 11. So small as to be visible only with a microscope.
  9. 14. The action of becoming larger or more extensive.
  10. 18. A measure of the disorder of a system.
  11. 19. A minute portion of matter.