During a failed attempt to discover gravity, Sir Isaac Newton fell face first into a snow bank while carrying a heap of delicious fruit—inadvertently discovering the health benefits of mixing squashed nutritious food with sub-Arctic cold. Replicate Newton's experiment under controlled conditions with today's Groupon: for $7, you get one medium and one small smoothie with one enhancer in each at Smoothie King (a $14.46 value). This Groupon is only valid at the St. John location.

Smoothie King smoothies combine fresh fruit, natural juices, and special nutritional enhancers into more than 90 flavors, all of which focus on achieving one of seven nutritional goals. Harness antiviral and antibacterial effects of hand sanitizer sans burning sensation with the pomegranate punch, an infusion of pomegranate, bananas, blueberries, apple juice, soy protein, and turbinado sweetener. Weight-conscious en-smuthiasts can trim down with the less-than-400-calorie Celestial Cherry High, packed with bananas, black cherry, papaya, turbinado, and honey. Customize any small ($5.99) or medium ($6.49) smoothie by adding one of the eleven enhancers ($0.99 each), including 8 grams of soluble fiber in the Fiber Blend or the friendly bacteria of Probiotic, which politely R.S.V.P.'s before arriving at digestive-tract dance parties.