Finance and credit card companies set the periodic rate of interest by dividing the annual percentage rate by a period of time. They apply the periodic rate to your outstanding balance to calculate ...

Carol M. Kopp edits features on a wide range of subjects for Investopedia, including investing, personal finance, retirement planning, taxes, business management, and career development. Betsy began ...

The periodic table of chemical elements hangs in front of chemistry classrooms worldwide and is an icon for science. Yet much was unknown about its history -- until now. The periodic table reflects ...

Science writer SAM KEAN transformed his childhood hobby of collecting Mercury from broken thermometers into his first book, “The Disappearing Spoon: and Other True Tales of Madness, Love and the ...