Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

How a 1950s study of social class and mental illness in New Haven changed the way people thought about mental health.

Some of the models used to forecast everything from financial trends to animal populations in an ecosystem are incorrect, ...

A recent study finds students who are the first in their family to attend college are more likely to drop out after receiving ...

Here is a close look at the common- versus differential-mode voltage and instrumentation amplifier (IA) topologies.

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Angelica Leicht is a seasoned personal finance writer and editor with nearly two decades of experience but just one goal: to help readers make the best decisions for their wallets. Her expertise spans ...

Peter is a writer and editor for the CNET How-To team. He has been covering technology, software, finance, sports and video games since working for @Home Network and Excite in the 1990s. Peter managed ...