Arthur C. Clarke once wrote that “any sufficiently advanced technology is indistinguishable from magic.” Well, good news, scientist-wizards: the creator of a new blood-type test cites a bit of magic from Harry Potter and the Chamber of Secrets as his inspiration!
Engineer Wei Shen created a papery surface for blood testing that displays its results by “writing” the blood type letter of the sample that touches it. Shen says...
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