What is love, actually? We asked scientists.

For World Kindness Day we explore the biological phenomenon that is love. USA TODAY’s HUMANKIND series “Is Love Actually” explores how love shapes our lives through real stories and expert insight. Hosts Madeline Gunderson and Ronnie Li join us for a deep-dive on the myriad ways we experience and express love. Let us know what you think of this episode at [email protected]. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.