Musician Conor Oberst gives us a topography lesson … A new movie - and fail-safe flirting tips - from actor Griffin Dunne… ‘Freakonomics’ Stephen Dubner is your kryptonite … Colson Whitehead becomes a gambling man … Inventing the futuristic fastener Velcro … Why bad words might be good for you … Annabelle Gurwitch finds lust in a hopeless place … And we inspect teff: a tiny grain with a huge upside.