Yesterday’s Wall Street Journal reports that a San Jose-based company called Thunderbolt Aerosystems hopes to popularize jetpacks. The jetpacks sell for $90,000, and the newspaper reports that the company’s founder admits that the packs - which emit a 1,300° exhaust stream - “can be dangerous for self-taught pilots.” Still, the firm says it has collected deposits from four prospective buyers.
Five years ago, optical heart rate tracking seemed like an obvious successor to the popular chest straps used by many fitness buffs, but the technology has faced myriad engineering challenges on its way to market acceptance.
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