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This is aphoto of two students talking their professor. Based on the formula the board,the students must have had a lecture on the theory of relativity. It looks tome as if the teacher is trying to explain the subject to the boys and thestudents could be trying to understand the equations. It’s hard to say for certain,but judging by their eager faces, the chances are that they might be makingsome progress in that direction. I can`t really tell, but they could be reallyinterested in physics.