As President Trump takes office, Katty Kay in Washington and Christian Fraser in London report on the events that are shaping our world.

John Peel and David Jensen present another edition of the pop chart programme, from April 1983. With Galaxy, The Creatures, Tears for Fears, Kissing the Pink and Spandau Ballet. Show more

Series exploring the paradise of Thailand. Northern Thailand, dominated by mountains and forests, hides ancient creatures and surprising partnerships. Show more

Dr Helen Czerski examines the extraordinary messages sound waves carry and how they help us understand the world around us. Show more

Sir David Attenborough tells the story of the discovery in Argentina of the largest animal to ever walk the earth, a new species of the plant-eating titanosaur. Show more

Examining the rise of the Nazis and their impact. Fear and hatred of Bolshevism drove many Germans to fight to the bitter end, despite continued suffering. Show more

Saul David uses the BBC archive to examine the most important stories, and how our understanding of them has been re-defined since World War II ended over 70 years ago. Show more

John Peel and David Jensen present another edition of the pop chart programme, from April 1983. With Galaxy, The Creatures, Tears for Fears, Kissing the Pink and Spandau Ballet. Show more

Musical memories from the BBC archives, featuring performances from Kool and the Gang, The Pointer Sisters, Grace Jones, Cameo and Sade. Show more

Series exploring the alchemy that creates great songs reaches the modern era, when music was transformed by digital technology and the computer. Show more

Dr Helen Czerski examines the extraordinary messages sound waves carry and how they help us understand the world around us. Show more