Harold McGee, author of Keys to Good Cooking: A Guide to Making the Best of Foods and Recipes, knows that we don’t always use a dozen eggs all at once. He shares a nifty way to test your eggs and separate the old from the new.

CHOW Tips are the shared wisdom of our community. If you’ve figured out some piece of food, drink, or cooking wisdom that you’d like to share on video (and you can be in San Francisco), email Blake Smith and tell us what you’ve got in mind.

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