Rudolph’s red nose could glow through bioluminescence

This time of year, “Rudolph the Red-Nosed Reindeer” is nearly inescapable. As the song goes, Rudolph is bullied for having a nose so bright it glows (like a lightbulb!). But one fateful Christmas Eve, his much-mocked nose makes Rudolph a hero. Using it as a beacon, Rudolph guides Santa’s flying sleigh through a foggy night to deliver gifts around the world.