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Note: The answer grid will include every letter of the alphabet.
BY EMILY COX AND HENRY RATHvON

It is a great day for science.
It is a great day for humanity.
When you realize your vaccine has a 90 percent effectiveness, that’s overwhelming.

—Albert Bourla, chairman and chief executive of pharmaceutical company Pfizer, speaking to CNBC after the firm announced preliminary results from a Phase 3 trial of its COVID-19 vaccine, developed in collaboration with BioNTech, that suggest it is 90 percent effective in preventing the disease (November 9)

This is really a spectacular number. I wasn’t expecting it to be this high. I was preparing myself for something like 55 percent.

—Akiko Iwasaki, an immunologist at Yale University, commenting on the Pfizer/BioNTech announcement (The New York Times, November 9)
ACROSS

1. Like muscle tissue with sarcomeres
6. Sir Humphry who isolated sodium
8. Unit of temperature named for William Thomson
9. Proteins that form microfilaments
10. Virus that infects prokaryotes
11. Slender projection of a neuron
12. Match up, as chromosomes during meiosis
16. Neurons in the cerebellum with many dendrites (2 wds.)
19. Vessel typically carrying oxygenated blood
20. Prove Darwin right?
21. Newtonian trio
22. Outermost germ layer of an embryo

DOWN

2. Sheath enclosing the spinal cord
3. Outside the body, as a test-tube experiment (2 wds.)
4. Arctic plain affected by global warming
5. Specimen of microscopic algae
6. Like Leeuwenhoek and Huygens
7. Acetic liquid
11. Where schools are held behind glass
13. Pharyngeal tonsil
14. Pepsin or trypsin
15. Flaw that might cause a mutation
17. Citric acid cycle’s name
18. Organ with a tissue of hepatocytes

© JONNY HAWKINS