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 ...

Sleep has two phases: non-rapid eye movement (NREM) and rapid eye movement (REM). It also has four stages that repeat in 4 to 6 cycles nightly. Each stage affects your body differently, from light ...

Healthy foods are usually whole foods that provide plenty of nutrients, stay low in saturated fat and sodium, and avoid additives like sweeteners. There are many healthy, delicious foods across fruits ...

When you’re choosing a new laptop or desktop computer, it’s important to understand the specs and features you’ll see listed by each model. That way, you can be sure to choose the right laptop for ...