George was under a lot of stress. His final semester examination was only 2 days away, and he was not prepared at all. To make matters worse, his right eyelid suddenly started twitching, and he...

George was under a lot of stress. His final semester examination was only 2 days away, and he was not prepared at all. To make matters worse, his right eyelid suddenly started twitching, and he couldn’t concentrate. Should George be worried about his eye? What is the reason behind this twitching?