Just before the plane doors closed, a young couple came on with a sleeping baby.

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This experiment does, however, suggest that genetics alone may explain some cases of SIDS. In the past, explanations have concentrated on environmental factors such as the smoking habits of the parents, bacterial infection and (most famously) a baby's sleeping position.

ECONOMIST: Sudden infant death syndrome

"It's tremendously rewarding to take a stressed baby and work with that baby until that baby is feeling better or sleeping, " Woodruff said.

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