Instinct took Silicon Valley by storm. Meet the 'brilliant' 23-year-old college dropout who started it.

Rebecca Zisser/BINoah Shinn was publishing influential AI research before he graduated from college. Now, at the ripe age of 23, he's taking on Mark Zuckerberg.Shinn's invite-only AI assistant, Instinct, seemingly came out of nowhere this summer, went viral among Silicon Valley insiders, and raised $250 million at a whopping $2.5 billion valuation.Its breakout has turned the college dropout into one of AI's hottest young founders and put his tiny startup in direct competition with another compan