With spring just around the corner, everyone from kids to older folks are beginning to think about getting back to the garden. PDQhealth talked wth Candice Shoemaker, professor of horticulture at Kansas State University, about her research into the health and longevity benefits of digging plants.

Smile and the world smiles with you, the saying goes. Cheerful findings from a groundbreaking study prove it. An exclusive interview with social network researcher James H. Fowler on how happiness spreads.

Yong Zhu, PhD, is assistant professor in the Department of Epidemiology and Public Health at Yale University School of Medicine, where he has been investigating circadian rhythms and cancer risk. In a recent article in the journal Medical Hypotheses, he proposed a provocative idea: that non-Hodgkin’s lymphoma could be linked to disruptions of circadian rhythm. PDQhealth asked him to explain.