Today's links - Goodhart's Law vs "prediction markets": Putting a gun to the metric's head. - Hey look at this: Delights to delectate. - Object permanence: Apple v interop; Yahoo v the world; Rasputin v the Haunted Mansion; Opening chord from A Hard Day's Night; Mondrian Pong; "IP": Patent trolls v Apple. - Upcoming appearances: Berkeley, Montreal, London, Berlin, Hay-on-Wye. - Recent appearances:...