Zero-emission truck maker Nikola has made a major shift in strategy. It's selling operations in Europe and refocusing on demand in North America. Production of its hydrogen-fueled trucks is set to begin this summer, and the company is also promising to deliver mobile refueling stations to get around the lack of hydrogen supply. Nikola stock fell nearly 13% yesterday after the company announced a quarterly loss of $170 million. Joining Julia to discuss all this is Nikola CEO Michael Lohscheller. 

Also on today's show: Hadi Partovi, CEO of the education nonprofit Code.org, talks about the need to embrace AI as a teaching tool. 

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