A tech startup said it could start a medical revolution with a little machine and a drop of blood. It was a fraud, but research into smarter, less invasive blood testing is a reality.

This episode of Today, Explained was produced by Will Reid and Miles Bryan, edited by Matt Collette, engineered by Efim Shapiro, fact-checked by Laura Bullard and hosted by Haleema Shah.

Transcript at vox.com/todayexplained

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