Switch to the dark mode that's kinder on your eyes at night time.

Switch to the light mode that's kinder on your eyes at day time.

Switch to the dark mode that's kinder on your eyes at night time.

Switch to the light mode that's kinder on your eyes at day time.

This Day in History: 1969-04-04

(April 04, 1969)
Denton Cooley, an American surgeon, placed the first full artificial heart in a human; the patient received a donor heart a few days later but died soon after.

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