Front line is everywhere,’ says Blaise Metreweli, first female chief of UK's foreign spy service, adding that the country is ...

Blaise Metreweli, Chief of the Secret Intelligence Service on how SIS is keeping the UK safe in a world where the rules of conflict are being ...

Learn the foundations of calculus using simple math concepts that are easy to understand, even if you’re new to the subject. This guide breaks down limits, derivatives, and basic integrals using clear ...

Discover a fast and powerful calculus-based method for finding square roots with impressive accuracy. This explanation shows how derivatives and iterative approximation can be used to quickly zero in ...

At first blush, Chinese e-commerce enterprise JD.com, Inc. (NASDAQ: JD) seems to have cast a dark shadow over bullish investors. For one thing, the performance of JD stock hasn't been all that great, ...