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" ... Thanks to a process called capillarity, the empty space between the slides would draw blood in, and the inner surfaces of the slides would be coated with a compound that reacts with glucose. Because the “cell” had a known volume, it then would be possible to measure the reaction and calculate the concentration of glucose in the patient’s blood. The really important part of Shanks’ invention is that capillarity can draw blood from a tiny pinprick into the cell, so diabetes patients who want to check their blood sugar only need to prick their finger with a needle. For many diabetics, that process is painful and annoying, but it’s a drastic improvement over previous tests, which actually required a small cut. ... "