Abstract: This study investigates the behavior of dual-frequency capacitively coupled plasma (DF-CCP) systems using numerical methods. The model determines a system of equations involving four ...

From classical to rock, musicians tune their instruments to a common pitch so they can play together harmoniously. For at least 80 years, that standard pitch frequency has been A440 Hz — which defines ...

David E. Dunning explores how mathematical notation is a social, world-building technology. It’s natural to think of math as being fundamentally abstract. Whether it’s invented or discovered, its ...

The central limit theorem started as a bar trick for 18th-century gamblers. Now scientists rely on it every day. No matter where you look, a bell curve is close by. Place a measuring cup in your ...

In March 2025, mathematician Daniel Litt made a bet. Despite the march of progress of artificial intelligence in many fields, he believed his subject was safe, wagering with a colleague that there was ...

For the unfamiliar, high-frequency facial wands “use a glass electrode filled with either argon or neon gas and a mild electrical current that passes through the gas, which creates a soft tingling ...

For the past several years, America has been using its young people as lab rats in a sweeping, if not exactly thought-out, education experiment. Schools across the country have been lowering standards ...

The frequency illusion, also called the Baader-Meinhof phenomenon, is a cognitive bias in which someone learns a novel word or concept—and then “suddenly” encounters it everywhere, whereas in fact it ...

War in Europe is a staple topic in the study of history, but there’s one major conflict most history books won’t teach you: the battle of the equal sign, =. These two parallel lines were, in fact, the ...

More countries are edging ahead of the United States in math and science achievement, according to the latest results from an international test of 4th and 8th graders in the subjects. The Trends in ...

Calcea Johnson (right), currently studying environmental engineering at Louisiana State University, published the new study with her high school classmate, Ne'Kiya Jackson (left), now a student in ...