Researchers exploit vulnerabilities of smart-device microphones and voice assistants

(I seem to have wandered into a number of digressions in composing this
piece, but they all seem to tie together, so I hope you'll bear with me ...)

Decades ago, I was at a teacher's conference.  I was in a session dealing
with computers in education.  The morning paper had published an article
about computers in education, and, particularly, using computers to teach,
and, therefore, replacing teachers.  Someone asked about this.  The
presenter thought for a moment, and replied …

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