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

Ben Garrod seeks out the big part that bones can play in reproduction. Through sexual selection, the skeleton has adapted to aid courtship, competition and even copulation. Show more

The wildlife documentary series with David Attenborough continues with a unique and intimate glimpse into the secretive lives of mountain-dwelling animals. Show more

Timeshift ventures inside places of sporting achievement, scientific endeavour and male obsession - the lofts of pigeon fanciers - to tell the story of a remarkable bird. Show more

Historian Dan Snow examines how two years of meticulous planning, espionage and the analysis of aerial photographs helped the Allied forces gain a foothold in northern France. Show more

Documentary following the hopes and ambitions of workers on Bombay's vast railway network, including Mumtaz Kazi, Indian Railways' first fully qualified female train driver. Show more

Margaret Mountford goes in search of the truth behind Sappho, the most controversial writer of the ancient world and the first authentic woman's voice in western history. Show more

Helen Rosslyn focuses on the 18th century, the Grand Tour era when aristocrats filled their Palladian villas with masterpieces by 17th-century classical painters. Show more

Art critic Alastair Sooke delves into the murky world of art theft. Despite the high stakes and daring involved, many of the crimes go unnoticed by the media. Show more

Timeshift ventures inside places of sporting achievement, scientific endeavour and male obsession - the lofts of pigeon fanciers - to tell the story of a remarkable bird. Show more