Why do my cookies get so hard when they cool?

or:Why do my cookies get so hard when they cool?or:Cookie science: sweets.seriouseats.com/2013/12/the-food-lab-the-best-chocolate-chip-cookies.html

or:Why do my cookies get so hard when they cool?

or:Cookie science: sweets.seriouseats.com/2013/12/the-food-lab-the-best-chocolate-chip-cookies.html

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