You may have seen on social media different versions of the so-called "five-date rule." Before you take five, so to speak, and follow it, consider its rationale and limitations.

For 30 years, law-enforcement officers have been empowered to be “clever”—and that cleverness has today become the cover for ...

According to Bredt's rule, double bonds cannot exist at certain positions on organic molecules if the molecule's geometry deviates too far from what we learn in textbooks. This rule has constrained ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Lea Uradu, J.D., is a Maryland state registered tax preparer, state-certified notary public, ...

Back in 2018, Bezos laid out his usual morning routine in a speech at the Economic Club of Washington. It includes reading the paper, drinking coffee, and having breakfast with his family. You know ...

Our guide explains Omaha poker, with rules, PLO betting limits, and hand-building basics. Includes format comparisons.