Miles Scott, dressed as Batkid, talks strategy with Batman before saving a woman from peril in San Francisco on Friday. The Make-A-Wish Foundation turned San Francisco into Gotham City for Miles, creating a daylong event to grant the leukemia survivor's wish to be a superhero. Jeff Chiu/AP hide caption

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To children the world is a vast experiment, a laboratory of how things interact with one another. hide caption

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Mom loved him. You love him. Prince performing in 1985. Ron Wolfson/Landov hide caption

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Laura Molina, 9, shows the mask she created expressing the feeling of "sadness." Her mother is being treated for breast cancer at the Lyndon B. Johnson public hospital in Houston. Carrie Feibel/KUHF hide caption

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Of Blocks And Books: Parents may be more likely to take a young daughter to the library than a son, and to read to the girl for longer periods of time, a new analysis suggests. Hulton Archive/ hide caption

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Even during sleep, babies' brains continue to take in and process angry voices. hide caption

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