Kombucha has exploded in popularity in the past few years. In any supermarket, cans and bottles of the stuff have taken over a large amount of fridge space. It's basically fermented black or green tea made into a tangy, fizzy drink. In our occasional series, Do It Yourself, Karyn talks to Bettina Mayer, who runs kombucha workshops in Kapiti, north of Wellington.

Almost 250 years to the day since James Cook saw the transit of Mercury across the sun, while anchored in New Zealand waters - and it's happening again tonight. A group of enthusiasts are gathering to watch it happening and hoping the cloud will clear so they can view the transit of Mercury from the same spot Cook would have watched it. Tonight's organiser is the director of Otago Museum, Dr Ian Griffin, who speaks with Karyn from Cooks Beach, Mercury Bay, on the Coromandel Peninsula.

Finn Johansson joins us with a preview of three new music selections on Out Lately. With his inimitable off-the-cuff casual critique, Finn takes us to Montreal for Little Scream aka Laurel Sprengelmeyer with No More Saturday Night from her album Speed Queen; followed by Dan Bejar of Destroyer with his newer than new Crimson Tide, before Louisa Nicklin delivers her single, The Residue.

In the small South Taranaki community of Eltham, Lindsay Maindonald won a seat on the Eltham Kaponga Community Board at last month's local body elections. But there's a catch. His bid for a seat on the Taranaki District Council was not successful, so when another community board councillor was elected to the Taranaki District Council, Mr Maindonald was successfully appointed to the Community Board - but no one knows. Lindsay Maindonald unravels the convoluted story from Eltham.

New Zealand Green Party MP Chloe Swarbrick has been making headlines around the world with her OK Boomer jibe during debate for the third reading for the Zero Carbon Bill. Bloomberg TV, the New York Times, NBC, Time Magazine, The Guardian, The Independent and the BBC have all picked up on the two words that have launched hundreds of tweets.

It's time to dive into the week's news, in the past. This week our resident historian Robert Kelly has his heart set on going to the 1939 Centennial Exhibition this time of year in 1939.

The Children's Commissioner Andrew Becroft is calling on the Royal Commission into abuse in care to use its powers to extend its investigation beyond the cut off date of 1999. Judge Becroft gave evidence today and says the Commission has the power to use its discretion to look into care before and after those dates.

Oranga Tamariki has apologised for how it handled trying to uplift a six-day-old baby from his mother in the Hawke's Bay in May. It was a highly publicised case and Oranga Tamariki's CEO says its review has found staff made a raft of poor decisions and failed to communicate properly with the family. Back in June, Jean Te Huia from Nga Maia Midwives Aotearoa was with the mother at the centre of Oranga Tamarki's ttempts to remove her newborn baby in a maternity ward - was on Lately. Tonight Jean speaks with Karyn again about Oranga Tamariki's review.

Mediawatch's weekly catch-up with Lately. Colin Peacock talks to Karyn Hay; New Zealand on Air puts its two cents into media policy debate; a controversial sponsorship, a pair of (mostly) pointless interviews and a single startling speech.

Auckland Arts Festival launched it's full program tonight. The program introduction reads: "In this, our 12th Festival, we grapple with the tough stuff: impending climate Armageddon, who gets to control the narrative, what constitutes appropriation, who we are allowed to love, and the collision of the traditional and the contemporary." The Festival's Artistic Director Jonathan Bielski talks Karyn through highlights from the program.