The professor ended his online class in one of two ways each time. He’d say, “See you next time” or “Have a good weekend.” Some students would respond with “Thank you. You too!” But one day a student responded, “I love you.” Surprised, he replied, “I love you too!” That evening the classmates agreed to create an “I love you chain” for the next class time in appreciation for their professor who had to teach to a blank screen on his computer. A few days later when he finished teaching, the professor said, “See you next time,” and one by…