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 ...

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 ...

Abstract: The integrity and longevity of road infrastructure are critical for ensuring safe and efficient transportation. How-ever, road deterioration is a pervasive issue, exacerbated by the ...