Nuclear Fusion Attracts Startups—and Skeptics

Recent technological breakthroughs and a surge in private funding have reignited interest in nuclear fusion, the atomic reaction that powers the sun and other stars.

Replication of the process on Earth has the potential to provide virtually unlimited clean energy to the world, according to researchers. But for decades that goal has eluded scientists, some of whom joke that nuclear fusion is 30 years away and always will be.