Best of the Week - 22 January 2016

Highlights from RNZ National's programmes for the week ending Friday 22 January. This week.... trends and challenges in media like the new visual Checkpoint with John Campbell, Sean Penn's interview for Rolling Stone with El Chapo - the world's most wanted drug lord, how the ethnic face of the nation is changing, we meet the Chung family who came here from Vietnam as "boat people", the first-ever survey of the genetic diversity of New Zealand's current population, Dave Dobbyn on the influence David Bowie had on him as a young musician fresh out of school , how to help young transgender people transition, a breeding programme in Wanaka for the Australasian crested grebe, and the New Zealand film producer who'se movie is nominated for several Oscars.