The BMJ just published an observational study explaining the redness of Rudolph's nose—evidently, reindeer have 25% more capillaries carrying oxygen-rich blood in their nasal architecture than humans. Now, I'm not sure that this investigation answers all the questions—it might answer why reindeers have red noses, but it doesn't answer why Rudolph has a luminescent one! My personal belief?—elf fairy dust.
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