What qualifies Dark Angel star Jessica Alba to write a book about keeping kids safe from hazardous chemicals? Find out Friday in Bethesda.

A number of Hollywood celebrities and other prominent women stopped by Unity Health Care in Columbia Heights on Thursday to speak with mothers of pediatric patients who have faced serious difficulties receiving health care. Jessica Alba, Keri Russell, Regina King, and Ali Wentworth joined Marian Wright-Edelman, the founder of Children’s Defense Fund, along with D.C. first lady Michelle Fenty before traveling to Capitol Hill to advocate on behalf of expanding health care benefits for children,…