Elon Musk lashed out at reports that he never delivered ventilators to California hospitals. Here's what's going on, and why Musk's ventilator efforts have become controversial. (TSLA)

· Elon Musk is calling out a report that he didn't follow through on his promise to deliver ventilators to hospitals in California. 
· CNN cited a report from the Sacramento Bee that the governor's office said no California hospital had received the 1,000 ventilators Musk promised last month. 
· Musk posted what he said...