Arden Moore

Actress Danica McKellar’s mission is to inspire girls to be whoever they want to be and to be as smart as they want to be.

Here’s news that smarts: Our brains can start to power down in our early 40s. That is, the complex mental processes we rely on to be our sharpest selves professionally could dull over time. Blame these acuity-robbing culprits: being overly focused on remembering every detail, quickly switching back and forth from one task to the…