love

Brent Moore / Flickr

This Valentine's Day weekend, along with chocolate and flowers, you can add one more tool to your arsenal: science.

Darwin Bell / Flickr

Sometimes an action by one person can have a profound and wonderful effect on the life of another. Charity Nebbe talks with four people who share their stories of how someone else changed their life. They share stories of supportive and inventive mother, an inspiring artist, an organ donor and a loving husband.