Shares of the nuclear start-up have soared nearly 500% this year. Here's what I really think of its prospects.Nuclear start-up Oklo's (OKLO +8.02%) stock has had an incredible run so far this year. After climbing 250% in the first half of the year, shares raced higher in September, when the company broke ground on its first-ever prototype nuclear facility.That explosive growth stalled out last month, however. The company's shares briefly peaked at $174.14 a share, and then dropped more than 25%. Can Oklo's ...