Katty Kay in Washington and Christian Fraser in London report on the events that are shaping our world.

Mike Read and Janice Long present the pop chart programme, first broadcast on 23 February 1984 and featuring Hot Chocolate, Rockwell, Marilyn, Nik Kershaw, Carmel and Howard Jones.

Sam Willis tells the story of the English ruler who left the most indelible mark on the castle, Edward I, as he turned it into an instrument of colonisation. Show more

Horizon investigates unusual space signals, including the Lorimer Burst, and has exclusive access to researchers at the Green Bank Telescope searching for signals from Tabby's Star. Show more

Professor Martin Rees, the astronomer royal, searches for extra-terrestrials in a film that gets inside the minds of the scientists considering whether we're alone in the universe. Show more

Michael Mosley lays bare the mysteries of the digestive system and reveals a complexity and intelligence in the human gut that science is only just beginning to uncover. Show more

Mike Read and Janice Long present the pop chart programme, first broadcast on 23 February 1984 and featuring Hot Chocolate, Rockwell, Marilyn, Nik Kershaw, Carmel and Howard Jones.

Lauren Laverne hosts an all-star discussion from London's iconic 100 Club, asking if rock 'n' roll is in crisis and what it now means in the 21st century. Show more

Sam Willis tells the story of the English ruler who left the most indelible mark on the castle, Edward I, as he turned it into an instrument of colonisation. Show more

Horizon investigates unusual space signals, including the Lorimer Burst, and has exclusive access to researchers at the Green Bank Telescope searching for signals from Tabby's Star. Show more