Prof Kathy Willis examines the mystery of a plant's ability to exist in multiple forms.
On 13 July 1954, celebrated Mexican artist Frida Kahlo died at the age of 47.
David Loyn investigates how a lost record is helping Afghanistan address its painful past.
Britain declares war on Germany.
Kathy Willis explores the harnessing of plants' ability to photosynthesise their own food.
5/6 Austria-Hungary's declaration of war on Serbia threatens to drag all of Europe into a war.
The British foreign secretary speaks in favour of war at the House of Commons.
Jarvis Cocker uncovers an album made by Sir John Betjeman in 1974.
The British cabinet is split over whether to join the war.
The German government receives word that Britain will remain neutral.
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