Girl joins Mensa before she even starts school

A four year old girl with the IQ of a "genius" has been accepted into Mensa - before she has even started school. Heidi Hankins sat an IQ test after staff at her nursery said she was so intelligent they were struggling to find activities to challenge her. The average score for an adult is 100 and a "gifted" individual 130 but the exceptional youngster impressed examiners with a staggering 159. Heidi - who can already add, subtract, draw figures and write in sentences - was reading books for seven year olds when she was just two. She beats numbers whizz Carol Vorderman (score 154) and is only slightly behind Big Bang scientist Stephen Hawking (160), who are both members of Mensa.