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 ...

Any sleet and snow will clear southwards during the early part of the night leaving most places dry and cold with clear skies. Tuesday Tomorrow will be a dry and cold day with plenty of winter ...

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 ...

Surds are square roots which can’t be reduced to rational numbers. Some can be simplified using various rules or by rationalising the denominator. Simplifying expressions using the laws of indices ...

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