A small number of children have taken part in a CHILL study, CHILL stands for Children's Health In London and Luton. After the children had their measurements taken and were given a pedometer to wear for the week, the whole year group took part in a science lesson where they learnt about DNA. During the science lesson they learnt how their genetics can determine lots of different things about their characteristics. The children had to sort themselves into different groups depending on whether they could or could not do something. These included rolling their tongue and whether they had dimples when they smiled.