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Every Christmas Day, after the kids are tucked into bed and my wife has drifted off on the couch, I turn off whatever holiday ...

Kelly Main is a Marketing Editor and Writer specializing in digital marketing, online advertising and web design and development. Before joining the team, she was a Content Producer at Fit Small ...

Throughout the universe, there are several underlying principles that we consider to be constants; for example, the speed of light in a vacuum. So many different aspects of our understanding of the ...

Planck's constant reveals the quantum world's fundamental energy levels. It shows how light and matter exist in discrete units (quanta). This constant defines limits to our knowledge of particle ...

Constant or chronic headaches happen 15 days or more in a month, for at least 3 months. These may result from conditions like tension headache or migraine. Treatment options include medications, ...

A team in Paris has made the most precise measurement yet of the fine-structure constant, killing hopes for a new force of nature. As fundamental constants go, the speed of light, c, enjoys all the ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. A loan constant is a percentage that shows the annual debt service on a loan compared to its ...

Michael Boyle is an experienced financial professional with more than 10 years working with financial planning, derivatives, equities, fixed income, project management, and analytics. SAUL LOEB/AFP ...