Whistle Stop Week

Don't say we don't ever give you anything - because here we are, giving you an extra 'Summer Special' episode to tide you over till Season 3 arrives in the fall! Joining host Mark Turner and regular team captains Carrie Simison and Mark Barz, a professor and her pupil, Laura Eurich and Melody Klema. See if you can work out which is which? We're still not sure...