It was time to play my medicine. I picked up an iPad and took control of a small yellow avatar, her hair standing on end, as mine would be by the end of the game. Dramatic chase music played as I swerved through a tight canyon, fetching swirling blue orbs but avoiding the cascade of other objects heading right at me. It was the video game version of patting your head and rubbing your tummy — and I didn’t feel very good at it.

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