Stress isn’t always a bad thing; it can be handy for a burst of extra energy and focus, like when you’re playing a competitive sport or have to speak in public. But when it’s continuous, it actually begins to change your brain. Madhumita Murgia shows how chronic stress can affect brain size, its structure, and how it functions, right down to the level of your genes.

In crowds, at parties, meetings, get-togethers with friends, everyday interactions: social anxiety can show up as an unwelcome guest at any time. But why? Psychologist Fallon Goodman digs into the source of social anxiety, setting the record straight about this common condition with practical solutions to help you feel the most authentically "you" while out and about.

Your favorite athlete closes in for a win; the crowd holds its breath, and at the crucial moment ... she misses the shot. That competitor just experienced the phenomenon known as “choking,” where despite months, even years, of practice, a person fails right when it matters most. Why does this happen, and what can we do to avoid it? Noa Kageyama and Pen-Pen Chen explain why we choke under pressure.

Our hard-wired stress response is designed to give us the quick burst of heightened alertness and energy needed to perform our best. But stress isn’t all good. When activated too long or too often, stress can damage virtually every part of our body. Sharon Horesh Bergquist gives us a look at what goes on inside our body when we are chronically stressed.

Sitting down for brief periods can help us recover from stress or recuperate from exercise. But nowadays, our lifestyles make us sit much more than we move around. Are our bodies built for such a sedentary existence? Murat Dalkilinç investigates the hidden risks of sitting down.