Spectacles have been around for centuries, and have a huge impact on many people's quality of life. So why is it estimated that more than two billion people aren't aware that they need them? Tim Harford considers the difference that seeing clearly makes to the world.
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Sources
Theories of Vision from Al-kindi to Kepler, 1981, David C. Lindberg, University of Chicago Press, p 209-210 and p 86
Microscopes and Telescopes, Rebecca Stefoff, 2007, Marshall Cavendish, New York, p 12-13 and p14-16.
Artifacts from Medieval Europe, James B. Tschen-Emmons, 2015, ABC-CLIO, Santa Barbara, p 260.
A History of Reading, Alberto Manguel, 1997, Flamingo, London, p293.
A History of Reading, Steven R. Fischer, 2004, Reaktion Books, London, p 186.
Broadcasts
- Sat 2 Nov 2019 05:50GMT成人快手 World Service except East and Southern Africa & South Asia
- Sat 2 Nov 2019 14:50GMT成人快手 World Service News Internet
- Sun 3 Nov 2019 14:50GMT成人快手 World Service East and Southern Africa & West and Central Africa only
- Sun 3 Nov 2019 15:50GMT成人快手 World Service Australasia, UK DAB/Freeview, News Internet, Online & Europe and the Middle East only
- Sun 3 Nov 2019 22:50GMT成人快手 World Service
- Mon 4 Nov 2019 04:50GMT成人快手 World Service South Asia
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50 Things That Made the Modern Economy
The stories of inventions, ideas and innovations which helped create the economic world
