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 ...

China hits US defence firms with sanctions over arms sales to Taiwan China's foreign ministry announced sanctions on Friday targeting 10 individuals and 20 U.S. defence firms, including Boeing's St.

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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 ...