It would appear that the computer mouse was presented to the world 40 years ago today.
http://news.bbc.co.uk/1/hi/technology/7768481.stm
It took 15 or more years after that for me to become aware of it even though I had been writing programmes for many years in the intervening period.
The mouse was outed
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The mouse was outed
Illegitimi Non Carborundum