This is a quiz about SIMPLE THINKING. Can you answer the three questions correctly? Research has shown that children can do this easily but adults can't. Please comment below on how you did.

The seventh episode of the seventh (or "G") series of the BBC comedy show QI (all about girls and boys), hosted by Stephen Fry and accompanied by guests Ronni Ancona, Jack Dee and Sandi Toksvig, alongside regular panellist Alan Davies. This is the "XL" extended edition, as first broadcast on Saturday 9th January 2010 at [...]