麻豆约拍

Protesters are on the streets of the capital Tunis again today to voice their opposition to new government austerity measures.

There have been riots in at least a dozen towns and cities across the country over the past few days. Police have fired tear gas and rubber bullets. On Tuesday, a crowd stormed a branch of the French supermarket chain Carrefour in the capital. The 麻豆约拍's Rana Jawad tells us more from Tunis.

In the rest of the programme, could drugs help delay or even treat diseases linked to ageing?

Dementia causes a gradual decrease in the brain's ability to think and remember. And it's predicted to pose a growing challenge to healthcare systems around the world, as our life expectancy grows. Now though, one of the world's biggest drug companies, Pfizer of the US, is pulling out of research into drugs to treat Alzheimer's, a form of dementia. Matthew Norton, policy director at the charity Alzheimer's Research UK, reacts.

Also, heavy snow in parts of northern Spain has sparked a row between the government and a private road operator. And the extraordinary biodiversity of the world's coral reefs is under threat. Mike Johnson presents.

(Photo: Tunisian protestors throw stones towards security forces in Tunis' Djebel Lahmer district after price hikes ignited protests in the North African country. Credit: AFP/Getty Images)