Smartphone accessory makers are continuously trying to convince buyers to spend extra money on iPhone and Android accessories, some more useful than others, including headphones, battery packs, cases and screen protectors, to name just a few of the most popular ones. But none of these products are-as useful as a recently revealed-iPhone and Android smartphone accessory that might forever change how some critical blood tests are performed. FROM EARLIER:-One more clever way Apple will get you to buy an Apple Watch As Science Daily reports, researchers from Columbia University managed to turn any smartphone running iOS or Android into a tool that can be used on the field to perform-quick HIV and syphilis testing. The gadget costs $34 to make,



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