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A university professor in Singapore a two-hour online lecture but didn't he was on mute. Professor Wang, who maths, was not aware that throughout his online presentation, the microphone on his computer was off. This that none of the students attending his online class heard what professor Wang was about. His university switched his classes online to reduce the spread of COVID-19. His lecture started well but then it . The video came back but the mic was off and professor Wang did not . One of his students says it might have been because the professor was an iPad and not a computer.

Students many times to contact professor Wang during the lesson but could not through to him. They their arms and even tried calling him on his personal phone. A video of the moment he his mic was off has gone viral on the Internet. It has more than 653,000 views. After realizing what happened, professor Wang shocked and stressed. He said he was upset at the thought of wasting two hours of his students' time. He has to redo the lecture at a different time so his students do not that class. One of his students on social media about the professor's mishap. She wrote: "I took a class under him before and he teaches well. I bad for him."