Vote for the 51st Thing! What should be the “thing” that we explore in a special final episode? Hear all about our shortlist: the credit card, glass, the global positioning system, irrigation, the pencil and the spreadsheet. To vote, go to www.bbcworldservice.com/51things. The deadline is 1200 GMT, Friday 6 October 2017. You can find full terms and conditions on the website.
Producer: Ben Crighton
Editors: Richard Knight and Richard Vadon
(Image: Montage of pencil, credit card, glass, spreadsheet, GPS, irrigation, Credit: Getty Images/Shutterstock)
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