Egg Fun Facts

Eggs can absorb odors through their shells due to the thousands of pores. Store them away from strong-smelling foods like onions or fish.

Source: USDA Egg Storage Guidelines

science

In the United States, eggs must be washed and sanitized before sale, which removes the cuticle (bloom). This is why American eggs require refrigeration — and European eggs don't.

Source: FDA Egg Safety Rule (21 CFR Part 118)

science

The air cell in an egg (the flat end) grows as the egg ages. USDA Grade AA eggs have an air cell less than 3.2mm (1/8 inch) deep.

Source: USDA Egg Grading Manual

science

Egg yolk color ranges from pale yellow to deep orange depending on the hen's diet. Hens eating marigold petals, red peppers, or corn produce darker yolks. Color doesn't indicate nutrition.

Source: Poultry Science Association

science

Fertile eggs sold in stores will not develop into chicks without incubation at the correct temperature (37.5°C / 99.5°F) and humidity for 21 days.

Source: University of Illinois Extension — Incubation and Embryology

science

Soufflés rise because air trapped in beaten egg whites expands when heated. The protein network holds the structure — until it cools and often collapses.

Source: On Food and Cooking, Harold McGee

science