Note that different people have different research approaches. The two old ladies check that none of them can see herself and the problem is solved! ;-)
The other older lady makes an experiment with motion and rigorously determines that she is ... well ... unsichtbar. :-)
Steve Jobs Lives on at the Patent Office - Years after his death, the former Apple CEO still wins more patents than most. What is Steve Jobs’s legacy? Here’s one measure: since his death in 2011 ...
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