Many problems in mathematical sciences are ‘easy to evaluate’, despite being typically ‘hard to solve’. For example, in computer science, NP-complete optimization problems admit a polynomial-time ...

Some renters are being inexplicably cut off from the city’s voucher program, a crucial tool for stemming homelessness. Housing advocates say it is a symptom of deeper problems. By Mihir Zaveri In ...

Congress is moving closer to taking action to rein in the long-troubled F-35 program, which has failed to meet its promises and is facing new problems with the latest generation. Two top Democrats on ...