Nina Lorez Collins is reimagining midlife and she’s bringing other women along with her – as the founder of the digital platform The Woolfer, and at Revel, a nationwide events and community platform for women 40+.

By her early 50s, TV executive Tammy Leader was “burnt out” and “deeply unhappy.” She did a 180, leaving corporate life to launch Campowerment—a camp for grownups—that infuses friendship, connection, community, and the spirit of the campfire into everyday life.

Spending time in the company of good friends boosts your endorphins and floods your system with serotonin. NYT science writer Jacqueline Mroz walks us through the science, history, and cultural forces that shape friendship.