Nuclear disruption — will starry-eyed startups win the nuclear fusion race? (Part 1)

The promise of nuclear fusion is clean, limitless energy for all. But why do start-up entrepreneurs think they can solve a problem that's perplexed scientists and fuelled the imagination of science fiction writers for decades? Are they kidding themselves, or inching closer to a breakthrough? Big name billionaires like Bill Gates and George Soros are now in the fusion game too.