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Bill Gates Calls - The Slingshot Channel Answers - YouTube
https://www.youtube.com/watch?v=tFISeJ1N5CQ
The Bill and Melinda Gates Foundation offers 100,000 USD for projects that improve things around condoms. http://www.grandchallenges.org/Explorations/Topics/...
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Welcome to The Slingshot Channel! - YouTube
https://www.youtube.com/watch?v=Ia0wYvmEGkU
This is the pilot episode for The Slingshot Channel, a dedicated channel that covers rubber powered launchers in each and every detail. Do you have questions...