Parents are failing to keep up with their children's scientific knowledge, a survey suggests.
Researchers for the Big Bang UK Young Scientists and Engineers Fair interviewed 2,000 parents of children aged between five and 16.
Two-thirds of parents said they struggled with their children's science queries and a quarter felt frustrated.
Professor Brian Cox, a spokesman for the fair, admitted children's science questions could be tricky.
Almost one in three parents said they were quizzed by their curious offspring on a daily basis. The questions often left parents embarrassed by their own failure to provide answers.
Professor Cox said: "With more and more youngsters getting stuck into science and maths both in and out of school, it's no wonder they are constantly questioning the world around them.