There are two basic ways to do fractions on your iPhone calculator. Here's what you need to know to use the built-in app.

There are two rules to remember when adding or subtracting fractions. The fractions need to have a common denominator. This means the denominator has to be the same. You only need to add or subtract ...

Introducing premature visual experience by opening the closed eyelids early in ferrets caused many cells in the primary visual cortex to mature improperly.