Quiz Quiz: How Much Do You Know About Twins?

Twins! All the cool kids are having them these days! (Including actress Zoe Saldana, tennis ace Roger Federer, and Prince Albert of Monaco.) But how much do you really know about these double blessings, who are more plentiful now than at any other time in American history? Take our quiz and find out if you’re a super star Scarlett Johansson or her twin (whom you've probably never heard of).

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