The Best of First Up for Friday 17 July

On the podcast today: Medical researchers are urging World Rugby to try reducing on-field player numbers in a bid to reduce injuries, Christchurch residents affected by a gas explosion on their street last year say Worksafe ignored them for too long. The government's covid tracer app - in need of a total re-design says one strategist - we find out what went wrong and could Chloe Swarbrick win the Greens first electoral seat in two decades?