This made me smile - DS6 and DS4 had the playdough out the other day and when I came downstairs they had "created" a DNA strand, using different colours for Cytosine (?), Adenine (?) etc. DS6 went on to explain that only certain ones will join together - it was so cute that I had to take a photo so that I can look back and smile when they are all grown up! Clearing up the mess was a different story, my boys and playdough are a very messy combination, but I couldn't complain as they had sat without leaving the table for close to 2 hours smile