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Teenage pregnancy is "contagious" between sisters, researchers in the UK and Norway have claimed. A study of more than 42,000 Norwegian teenage girls suggested they were more likely to become pregnant if their older sister had a baby as a teenager. The effect was greatest when the sisters were of a similar age or from a poorer background.


 teenager pregnancy sister sibling family influence poverty education contagious
Contagious yawning may show the closeness of your relationships rather than your tiredness, say scientists.


 yawn brain empathy family friendship contagious social behaviour