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Bicycling in Uganda
On a bike ride in Uganda, William Peterson shot pictures of…
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Amazon may drone on about unmanned delivery, but…
As intriguing as the Amazon drone, the Prime Air, was in…
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Streamlined and pedal-powered velomobiles
Human-powered cars have come a long way since the Flintstones. Today’s…
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Made in Cameroon: Low-cost, heavy-duty farm truck prototypes
If farmers in the west central African nation of Cameroon were…
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How to Make Penetrating Oil
Stir acetone into vegetable oil for a low-cost, do-it-yourself penetrating oil.…
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A 12-year-old engineer designs a life-saving travois for…
Chase Lewis, age 12, has designed a life-saving device that refugees…