The proof, known to be so hard that a mathematician once offered 10 martinis to whoever could figure it out, uses number ...

The setup is simple. One partner points out a bird to the other — or in a common variation, recounts a fake bird encounter from earlier in the day — and awaits a response. A partner who responds with ...

They are each built on one of three paradigms that has dominated international relations theory since World War II: realism, liberalism, and constructivism. Realists see politics as rooted in anarchy, ...

Machine learning models are designed to take in data, to find patterns or relationships within those data, and to use what ...