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Max Pearson presents a collection of this week's Witness History episodes from the BBC World Service.

We hear about Vietnam's manicure godfather, how Bengaluru became India's Silicon Valley and how the first ever photograph from a mobile phone was sent.

Plus, the popularity of theoretical physicist Prof Stephen Hawking's book, A Brief History of Time, and the windmill that revolutionised wind power.

Contributors:

Tuong Vu - Professor of Political Science at the University of Oregon. \\nKien Nguyen - Wife of Minh Nguyen.\\nNarayana Murthy - Founder of Infosys.\\nPhilippe Kahn - Software engineer and owner of world's first mobile phone photo.\\nPeter Guzzardi - Publisher and editor.\\nBritta Jensen - Teacher.

(Photo: Minh and Kien Nguyen outside beauty school in California. Credit: Kien Nguyen)