Truth: Though HIV can be transmitted from mother to child, it is completely possible - and completely normal - for positive mothers to give birth to happy, healthy babies.

真相：是的，艾滋病毒可能会通过母婴传播，但这并不是绝对的。艾滋病毒呈阳性的女性也可以生出完全健康的孩子。

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For positive events, such as marriage or childbirth, the effect was equally transient - the researchers calculated that the happiness increase delivered by the birth of a child lasted for two years before the volunteers ratings were back to normal.

BBC: Happiness 'immune to life events'