NPR's Ailsa Chang speaks to mathematician Eugenia Cheng about the Pascaline -- a 17th-century invention credited as the first mechanical calculator.

For most investors, how much a stock's price changes over time is important. Not only can it impact your investment portfolio, but it can also help you compare investment results across sectors and ...

What house payment can I afford? Use our calculator to see how much house you can afford based on the mortgage you may be allowed to borrow. Share details of your income – and your partner’s, if ...

First, it’s helpful to enable the “Change with Buttons” option in your Settings under Sounds & Haptics. This feature allows you to easily adjust the volume using the side buttons without digging ...