Natural selection uses duplicated genes as raw material for functional innovation, co-opting their existing features to new functions. Understanding genetic innovation requires two questions to be ...

Learn how to quickly find duplicates in Excel, whether you’re comparing one list or two. This tutorial shows step-by-step methods for highlighting duplicate values, using formulas, and speeding up ...

Booking affordable airfare can be a turbulent process. Prices rise and fall day by day, or in some cases, hour by hour. In the past, frequent fliers swore by loose strategies to find deals—book on a ...