One of the main reasons we drink milk is for the calcium: the mineral makes your bones stronger, muscles healthier (including in your heart), and helps blood to clot.
Now, researchers at the University of Wisconsin-Madison have discovered a way to boost calcium levels in milk by giving cows regular injections of the hormone serotonin, a chemical messenger that, among other things, is linked to feelings of happiness.
If you think the life of a modern milk cow is already pretty happy—lounging in green fields under clear blue skies—think again. According to Modern Farmer:
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