Curious children ask a staggering 73 questions every day ... half of which parents struggle to answer, according to a study. Researchers found amid the bombardment of who, why, what, when, where and how many parents end up turning to Google for answers, or making one up on the spot.   The study also revealed children’s inquisitive nature peaks at four-years-old for both boys and girls, to the despair of mothers, fathers and carers.   Kids from the capital proved the most