Magazine content is available exclusively for TIME subscribers.Sizing Up The Sexes
What are little boys made of?
What are little boys made of?
Frogs and snails
And puppy dogs' tails,
That's what little boys are made of.
What are little girls made of?
What are little girls made of?
Sugar and spice
And all that's nice,
That's what little girls are made of.
-- Anonymous
Many scientists rely on elaborately complex and costly equipment to probe the mysteries confronting humankind. Not Melissa Hines. The UCLA behavioral scientist is hoping to solve one of life's oldest riddles with a toybox full of police cars, Lincoln Logs and Barbie dolls. For the past two...
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