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A hot potato: A lot of people are angry at the sight of robots carrying out deliveries, seeing it as another sign that machines are making more human jobs obsolete. One such person, a 78-year-old retired professor, made her displeasure known last week by repeatedly standing in front of a delivery robot, blocking its path. The situation ended with her being handcuffed and arrested, but it hasn't deterred her from staging more protests.

Carolyn Marvin, a professor emeritus at the University of Pennsylvania's Annenberg School of Communication, decided to take a literal stand against an oncoming Avride delivery robot from Uber Eats in Philadelphia's Center City.…