You hand out a new assignment—the directions are clear, the task is solid, and you think, They’re going to crush this. Five minutes later, a few students are already checked out, pencils still, eyes ...

BRUSSELS — Ukraine is facing a worsening shortage of soldiers as record numbers of men flee to Europe, Kyiv Mayor Vitali Klitschko warned in an interview. “We have huge problems with soldiers — with ...

Is 170,141,183,460,469,231,731,687,303,715,884,105,727 prime? Before you ask the Internet for an answer, can you consider how you might answer that question without a ...