Why is the sky blue?
Why do you close your eyes when you sneeze?
We were surprised to find that not everybody has this reflex. Sneezing is controlled by the medulla oblongata, the section of the brain that also oversees primitive functions like heart rate and breathing. What we couldn't find out is a definitive answer to the question. We heard speculation -- but only that -- that the closure could be a defensive reaction that keeps exhaled viral particles out of your eyes.
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