Sydney Page is a staff reporter who writes for The Washington Post’s The Optimist section, a collection of stories about humanity. She also authors The Optimist weekly newsletter. She has been a ...

Psychology Today's online self-tests are intended for informational purposes only and are not diagnostic tools. Psychology Today does not capture or store personally identifiable information, and your ...

At the height of his fame, Parsons wasn’t celebrating his success.

A mean platelet volume (MPV) test measures the average size of your platelets, which are small blood cells that help with blood clotting. Typical MPV levels range from 7 to 13 femtoliters. High MPV ...