- The intensity of a tropical cyclone is usually determined by the Dvorak technique using only visible and infrared satellite images? ... that a mercury arc rectifier converts alternating current to direct current by means of an electric arc through mercury vapor?
- The technique of double-balloon enteroscopy allows any position along the gastrointestinal tract to be visualized in real-time?
- The record for the longest manned spaceflight stands at 437.7 days, which was set by Valeriy Polyakov aboard Mir, An electronic gear-shifting system for bicycles can shift faster than a traditional mechanical system and calibrate itself to minimize maintenance?
http://en.wikipedia.org/wiki/Portal:Technology
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