Sigma

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Across
  1. 5. Chemotherapy that came from observations of mustard gas
  2. 9. Common element in supermassive stars
  3. 11. Meteorite that contained 70 amino acids unknown to Earth
  4. 14. Man-made satellite that allows astronauts 16 sunrises and sunsets/day
  5. 15. First physics teacher to roll to the bottom of a hill on a bicycle
  6. 16. Revolutionary gene-editing tool
  7. 18. Study of a biological "building block"'s interactions and functions
Down
  1. 1. Element named after a Scandinavian goddess
  2. 2. Past press and player liaison officer for Hull City
  3. 3. __ equation estimatesnumber of communicative civilisations in Milky Way
  4. 4. Element of which one pellet contains eq. of 149 gallons of oil
  5. 6. Experiment that first demonstrated wave-particle duality of light
  6. 7. Learning technique introduced by Tony Buzan
  7. 8. Chair or boat conformation molecule in organic chemistry
  8. 10. Tree that flowers in January
  9. 12. Physics teacher that is most likely to be radioactive
  10. 13. Wavelength that can be used to detect minute differences in heat
  11. 17. Predator driven to extinction in the UK