More than 2,000 serious athletes, fitness enthusiasts, families, and Lurie Children's supporters climb 80 floors to the top of the Aon Building as part of the 15th Annual Aon Step Up for Kids stair climb. The event benefits fundraising efforts of K.I.D.S.S. for Kids, an affiliated organization of Ann & Robert H. Lurie Children's Hospital of Chicago, and the hospital's Family Services department, which serves children and families treated at the Hospital. For more information, visit the website.