An Amazon workers pull a cart of packages for delivery on E 14th Street on July 12, 2022 in New York City.Michael M. Santiago | Getty ImagesAmazon Prime Day, the 48-hour discount blitz that kicks off Tuesday, is a "major" cause of worker injuries, according to the preliminary results of a Senate probe.The Senate's Health, Education, Labor and Pensions (HELP) Committee on Tuesday released the interim results of a yearlong investigation into Amazon's warehouse working conditions just as the compan...