How Karooooo CEO Zak Calisto (KARO) monitors vehicle fleets and uses software to fight crime in Africa. Guardant Health (GH) shows positive results for a groundbreaking blood test for a type of cancer. How Vroom (VRM) manages the struggle of selling cars online. Beyond Meat (BYND) is reminded that the numbers don’t lie. The Drill Down with Cory Johnson offers a daily look at the business stories behind stocks on the move.
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