The question asked today is if goldfish really do have bad memories.

The question asked today is what is the largest animal of all time.

Doctor Knowles and Professor McCork get to the bottom of some of life's biggest science questions. Dr Knowles and Professor McCork ask the question 'How does my heart keep beating?' Backstage, Ms Hucklebuck challenges everyone to solve a tricky riddle. Colin decides to start a new fitness regime which helps Knowles realise that she might need more than pure brainpower for this tricky challenge.