Nissa Scott started working at the cavernous Amazon warehouse in southern New Jersey late last year, stacking plastic bins the size of small ottomans. It was not, she says, the most stimulating activity. And lifting the bins, which often weigh 25 pounds each, was also tiring over 10-hour shifts.
Now Ms. Scott, 21, watches her replacement — a giant, bright yellow mechanical arm — do the stacking.
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