apparently what you do is put them in water. if they sink they're really fresh. if they float a little then they're getting old and if it bobs on the surface it needs throwing. it's because of the porous shell letting in air as time passes.
in the long run they're not expensive fresh ones are better for all types of cooking and it isn't worth the risk. just go and replace them after a couple of weeks at most.
Actually, older eggs are better for hard boiling and old egg whites whip better than very fresh ones. The price of eggs has doubled in the last year. The only less expensive eggs that I can find are sold in large (7.5 dozen) boxes at places like Costco and Gordon Food Service. Old and spoiled are not the same thing.
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