The fact that eggs keep without being refrigerated is what led to the Easter Egg.
When early Christians fasted for Lent in the early days (first millennium, etc.), they were much more hard core: no meat, but also no fish, no eggs, no nothing that would offend a vegan.
You could delay butchering your animals until after Lent. You could make your milk into cheese, and eat it later. But eggs just piled up. So went the fast was broken on Easter, everybody ate eggs. Lots of eggs. Oh, have mercy, lots of eggs.
Ha! Another mystery of life explained.