It Pays to Smile – Sick Science! #171

Show us your money maker! Those pearly whites! That beautiful grin! How often do you look at the face of the president pictured on your paper money? What’s the facial expression of the president? Happy? Sad? Believe it or not, you can make George Washington’s face smile or frown on a dollar bill if you know the secret to this visual foolery.

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from Steve Spangler Science