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. :-)
Smartphone Secrets May Be Better Than a Password - Researchers are investigating whether recalling text messages, calls, and Facebook likes could be a useful log-in strategy. Before you read this story, t...
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