2. That's what I learned too and I always thought it worked. But
when my daughter needed to sneeze today, my mom told her to look at the ceiling (which I found really funny). So then I thought maybe I got it wrong and all that was needed was to look up to sneeze.
Light activates the tear duct, Looking up causes the tears to flow back into the nasal cavity (there really is a connection between the two) and tickle it - Big sneeze!
I often have three big sneezes in the morning when I drive east towards the sun, and once heard a science guy on the radio explain the mechanics.
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