This week Neil has some pressing questions for the teams, like can pigeons be trained to spot cancer and are men more attracted to women with higher body weights when they’re hungry? He also takes a break from his quizmaster duties to take to the skies and endure a gut-wrenching aerobatic flight – doing loop the loops, rolls and corkscrews in a tiny plane to demonstrate Quaternions: complex numbers discovered by Irishman William Rowan Hamilton.