As President Trump takes office, BBC News teams in Washington and London report on the events that are shaping our world.
Ben Garrod uncovers the secrets of how vertebrates capture and devour their food using extreme jaws, bizarre teeth and specialised bony tools. Show more
Wildlife documentary series presented by David Attenborough, beginning with a look at the remote islands which offer sanctuary to some of the planet's rarest creatures. Show more
Documentary which follows a Japanese-led team of scientists as they attempt to shed light on the mysterious world of deep sea sharks, using midget submarines to film them. Show more
Documentary following an international team of scientists as they deploy underwater robots and state-of-the-art submersible vessels off the coast of Japan to find the giant squid. Show more
Documentary which tells the story of Rolls-Royce in India by following the fortunes of India's princes from the zenith of British imperial power to the decline after independence. Show more
Documentary about Bombay's vast suburban rail network, which serves millions of commuters every day and struggles to cope with the peaktime 'super-dense crush load'. Show more
Bought with Love: The Secret History of British Art Collections
Episode 1: The Pioneers
59 minutes on BBC Four
Available for years
Helen Rosslyn reveals the influence of the 17th-century British pioneer collectors such as Thomas Howard and how the Whitehall Group brought a taste for the Baroque. Show more
Dr Janina Ramirez unlocks the secrets of a centuries-old masterpiece in glass, the Great East Window at York Minster, the largest expanse of medieval stained glass in the UK. Show more
Wildlife documentary series presented by David Attenborough, beginning with a look at the remote islands which offer sanctuary to some of the planet's rarest creatures. Show more