The number of locations of interest, and close contacts, continue to grow in the Delta outbreak. There are now 210 active cases in the community. But the good news is, Google's latest Community Mobility Report shows New Zealanders appear to be sticking to the lockdown rules and have drastically reduced their movement. Māni Dunlop talks to Michael Plank, who is a Professor in the School of Mathematics and Statistics at the University of Canterbury, about what the data tell us.