Syrian forces leave Sweida

Syrian government forces have left the southern city of Sweida, where days of sectarian clashes involving the Druze minority have left hundreds dead. Interim President Ahmed al-Sharaa made a call for unity in the middle of the night.Also in the programme: proof that a technique using genetic material from three people to create embryos is leading to children born free of incurable and devastating mitochondrial disease; and an interview with Columbia University graduate Mahmoud Khalil, who was detained for more than 100 days after taking part in pro-Palestinian demonstrations on campus.