Scientists have been working for decades to replicate the sun's nearly limitless energy on Earth through nuclear fusion. Now investors are pouring billions of dollars into startups working to make it happen on a commercial scale. WSJ energy reporter Jennifer Hiller joins host Zoe Thomas to explain why the holy grail of energy has been out of reach for so long, and why money for its development is pouring in now. Learn more about your ad choices. Visit megaphone.fm/adchoices