After finding the homeschooling life confining, the teen petitioned her way into a graduate class at Berkeley, where she ended up disproving a 40-year-old conjecture. Valerie Plesch for Quanta Magazine Introduction It’s not that anyone ever said sophisticated math problems can’t be solved by teenagers who haven’t finished high school. But the odds of such a result would have seemed long. Yet a paper posted on February 10 left the math world by turns stunned, delighted and ready to welcome a bold...