evidence: The National Institute of Neurological Disorders and Stroke notes these major signs of stroke: [...] Another ‘sign’ of a stroke: Ask the person to ‘stick’ out his tongue. [...] —Face drooping on one side or numb —Arm weak or numb —Speech slurred;unable to speak; difficult to understand; unable to repeat a simple sentence —Time to call 911 immediately if person shows any of these symptoms, even if symptoms go away