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What was the computer "mouse"?
(lemmy.sdf.org)
The computer mouse was a pointing device invented in the 1960s by Douglas Engelbart as a means of avoiding the use of the finger to smear dirt and oil on glass particularly at ATMs and PoS stations.
It's so weird that I'm typing this reply on a device millions of times more capable than that machine while at the same time, that machine feels a million times more magical to me.