This lesson covers solved numerical problems on molarity, molality, mole fraction, and percentage concentrations to help you clearly understand solution concentration concepts in chemistry.

Although not a household scientific name like Albert Einstein or Isaac Newton, Indian mathematician Srinivasa Ramanujan—who tragically died in 1920 at the age of 32—was one of the greatest minds in ...

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A French court has blocked the export and foreign purchase of a 17th century arithmetic machine invented by Blaise Pascal to help ease the laborious task of calculating taxes. The sale of an ancient ...

The Danish author Solvej Balle’s experimental opus reframes the tedium of contemporary life as a source of unexpected wonders. Solvej Balle in her garden in Denmark.Credit...Giulia Mangione for The ...

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Calculating the cost of goods sold gives a business insight into its performance and helps calculate profit. Many, or all, of the products featured on this page are from our advertising partners who ...

HELOCs, or home equity lines of credit, give homeowners a way to leverage the growing value of their house for anything from renovations to college tuition — and enjoy 10 years of interest-only ...

Return on ad spend (ROAS) is a common metric or key performance indicator for paid search campaigns. PPC managers and digital marketing executives have been using it for a long time. In fact, it isn’t ...

Since its inception, in 2000, Gavi, the Vaccine Alliance, which works with local governments to bring vaccines to low-income countries, has helped administer 1.9 billion vaccines and reached a billion ...