1. Dr. FRED BUCKHOLD, SLU Care General Internist at SSM Health Saint Louis University Hospital, and a professor of medicine at St. Louis University School of Medicine. Friday's global tech outage affected many computers -- how was Saint Louis University Hospital affected? Lessons to be learned about electronic medical records?; Biden tests positive for COVID -- dangers for older people with COVID?; New study finds Ozempic may protect against cognitive decline and addiction; Women who survived cardiac arrest more likely to be treated for anxiety and depression.

2. Dr. ZIYAD AL-ALY, Washington University clinical epidemiologist. Dr. Al-Aly's latest study finds the risk of long COVID declined over the course of the pandemic. What exactly did he find? What is causing the decline? What's the message for listeners?

3. Dr. KATHERINE WEILBAECHER, Washington University medical oncologist at Siteman Cancer Center. Last weekend, actress Shannon Doherty died of breast cancer at the age of 53. What lessons are to be learned from this tragic death? What are the latest breast cancer treatments? What's the best way to try to ward off breast cancer?

4. Dr. PRAVEEN RUDRARAJU -- Director of the Center for Sleep Medicine at Northern Westchester Hospital and Phelps Hospital in New York with WCBS Radio's Brigitte Quinn. A new study shows that doing exercise before going to bed can lead to a better night's sleep. How is that possible? What about vigorous exercise? Is morning or nighttime better for exercise?