Nearly 800,000 people experience a stroke each year, according to the National Stroke Associated. Luke Perry became one of those people when he suffered a stroke Wednesday and was rushed to the hospital. The "Rivedale" actor remains at a California hospital. It's a reminder of the seriousness of this medical emergency. How can you tell if someone is having a stroke and how can you help? Remember to act “FAST,” according to the National Stroke Association.