Interesting fact: Willem Kolff created the first dialysis machine in the Netherlands during WWII.

Interesting fact: Willem Kolff created the first dialysis machine in the Netherlands during WWII. Lacking materials, he used sausage casings, tin cans, a washing machine, and salt water. He also saved more than 800 people from the Nazis by hiding them in his hospital. And he later invented the artificial heart.
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