National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...

Computational models are mathematical models used to numerically study the behaviour of complex systems by means of a computer simulation. A computational model can be used to make predictions of the ...

U.S. President Donald Trump threatened on Friday to come to the aid of protesters in Iran if security forces fired on them, days into unrest that has left several dead and posed the biggest internal ...