Australia’s under-16 social media ban comes into force soon. From 10th December, platforms must take 'reasonable steps' to stop under-16s from opening accounts and remove accounts that already belong to them. Companies who fail to comply could face fines of up to £25m. BBC Sydney Correspondent Katy Watson has been talking to teenagers in the state of Victoria. She explains how we got here and updates us on a new legal action being brought to challenge the ban.

Ever wondered what your bottom says about your health? A new study of over 60,000 people reveals that subtle changes in the shape of your buttock muscles can reveal when people are heading towards type two diabetes. The study was carried out by the University of Westminster. Louise Thomas, Professor of Metabolic Imaging who is the senior author of the study, joins us alongside personal trainer Jacqueline Hooton.

We talk to the author of a review of how the justice system treats girls. They can no longer be sent to Young Offenders Institutes as a result of Susannah Hancock's recommendations, but she says there is still plenty of work to be done and much of the remaining custodial accommodation needs improvement. Pippa Goodfellow, Deputy Director of Policy, Communications and Strategy at the National Children’s Bureau, who will serve on the government’s new advisory board on these matters, also joins us.

A new exhibition, ‘Learning to See,’ by the abstract artist Bridget Riley has opened at Turner Contemporary in Margate. There are 26 of her most recent works on show - large canvases, studies and works painted directly on the wall. To talk about Bridget’s life so far and the significance of her work, Nuala McGovern is joined by artist Dame Tracey Emin, Melissa Blanchflower, senior curator of the exhibition and Dr Frances Follin, author of Embodied Visions: Bridget Riley, Op Art and The Sixties.

Presenter: Nuala McGovern Procuer: Simon Richardson