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: 1942-08-11

(August 11, 1942)
Frequency-hopping spread spectrum communication technology patented by Hedy Lamarr and composer George Antheil.
photo source: wikimedia.org

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