A study in BMJ’s Christmas issue, which spares no effort in its annual attempt to see who in science media rewrites press releases without even reading them, has determined why Rudolph, the famous extra reindeer of Santa we will not show here due to little desire to pay royalties, has a red nose.

Rudolph’s nose is red because it is richly supplied with red blood cells which help to protect it from freezing and to regulate brain temperature. This superior “nasal microcirculation” is essential for pulling Santa Claus’s sleigh under extreme temperatures, says the BMJ study.
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