Paul A. Rahe on “The History of the Peloponnesian War,” by Thucydides, edited and translated by Robin Waterfield.

Brian Beers is a digital editor, writer, Emmy-nominated producer, and content expert with 15+ years of experience writing about corporate finance & accounting, fundamental analysis, and investing.

Christina Majaski writes and edits finance, credit cards, and travel content. She has 14+ years of experience with print and digital publications. Robert Kelly is managing director of XTS Energy LLC, ...

Pain comes from communication between nerves, the spinal cord, and the brain. Pain may be acute, chronic, neuropathic, or nociceptive. Acute pain is sudden and usually linked to injury, then improves ...

It’s a familiar moment in math class—students are asked to solve a problem, and some jump in confidently while others freeze, unsure where to begin. When students don’t yet have a clear mental model ...

What is an exclamation mark? Sentences that end in an exclamation mark are used to show intense feelings or get attention. You can use an exclamation mark ! to show when your sentence is saying ...

A complex sentence communicates more than one idea. One part (the main clause) is like a simple sentence: it can stand on its own. The other part (the minor clause) gives more detail about the simple ...