Cary Subel, left, and Alaey Kumar are co-founders of SafeSleeve, one of many companies selling products that block radio frequency energy from cellphones, tablets and laptop computers. Photo courtesy of SafeSleeve

Cary Subel, left, and Alaey Kumar are co-founders of SafeSleeve, one of many companies selling products that block radio frequency energy from cellphones, tablets and laptop computers. Photo courtesy of SafeSleeve

Cary Subel and Alaey Kumar have built a business on the foundation of technology — specifically, public unease over technology...

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