On the morning of Saturday 3 September 2016, I was interviewed by Kim Hill at Radio New Zealand. She is the master interviewer in New Zealand, and we had a lot of fun. We discussed optimal exposure times to achieve vitamin d sufficiency without getting sunburnt – which is to be avoided as it can be a precursor to the development of skin cancer. I emphasised that to make sensible decisions on this you need to know the UV index (UVI), which is now available in real time everywhere through the development of apps such as “uv2Day” (restricted to the South Pacific region), and “GlobalUV”. The apps also give appropriate behavioural advice based on the current UVI and the skin type. Both apps are available for free on iphone and android systems. For more information, listen to the full interview (about 15 minutes long).