Post-traumatic stress disorder (PTSD) is a psychiatric disorder, occurring as a by-product of witnessing or experiencing a traumatic event. The most common causes of PTSD are a natural disaster, vehicular accidents, an act of terrorism, wartime combat, sexual assault, or any other violent act. This isn’t even close to a full list.

Seasonal Affective Disorder—or SAD—might be one of the most appropriate acronyms in medical history. It’s a depressive condition that reflects the ultimate battle between light and darkness—sunshine hidden by clouds, and sunsets happening quicker and sooner than ever. As a result, symptoms usually start in the fall, and subside in early spring or summer.

When we worry about aging, many of us focus on things like greying hair, or developing wrinkles in our skin. But in addition to our external body growing older, our insides — including our muscles, skeleton and organs — also experience wear and tear over time.

Throughout our lives, we’re constantly bombarded with medical advice. You may have heard that you should be taking 10,000 steps a day in order to maintain your health. This is the equivalent of five miles or 100 minutes of brisk walking per day at a rate of 100 steps per minute.

The kidneys are a pair of organs located on either side of your spine, just above your waist. These organs are four to five inches long, and their function is to filter impurities from the blood, balance electrolytes in your body, and control blood pressure.