IODA project ESRs Orest, Rejish, Kumar and Salvatore completed an outreach activity at the BigBang London Fair in Uxbridge College, London on 6th July 2017. The ESR's Rotor-Test-Stand was an eye catcher to the students who attended the event. The moment the rotors were set in motion they gathered around and watched in amazement and enjoyed a game of "choose your best propeller". The ESRs were pleasantly surprised to receive intriguing questions from those watching who then managed to pick the right propeller and win! Well done to all those who took part and displayed great scientific intuition.