Many people are raising their own chickens, so they have an ample supply of free-range, organic eggs in their own backyard. But ask anyone who has done this, and they will tell you there are times when the supply far exceeds the demand. Whether you raise chickens or not, if you find yourself with an extra supply of eggs (maybe they were on sale), do two things to extend the life. First, use a pencil to mark the eggs with the date you collected them; use the older eggs first. Second, since eggshells are porous, you can coat them with vegetable oil if you aren't planning to use them right away. This creates an airtight barrier and keeps the insides of the eggs fresher for longer.