Motorcyclists over the age of 60 are three times more likely to be hospitalised after a crash than younger bikers, a US study suggests.

BBC: Older motorcyclists 'more likely to be injured'

This US study suggests a shift in the age of those experiencing stroke, from the old to the young, although experts say the findings need to be treated with caution.

BBC: Strokes in young people 'rising', study finds

But a study in 1962 by US doctor Robert Bradley suggests that the father's presence actually helps the woman relax.

BBC: How it became almost mandatory for dads to attend the birth