Puzzles of Electricity : Mr Grey


Today, he wears grey -- a short-sleeved grey t-shirt.
Yesterday, he wore grey jumper with white, short-sleeved t-shirt inside.
He will take off his jumper whenever he's in the auditorium cause the heater in auditorium is just too hot. He looks like he's gaining weight or maybe he starts going to the gym?
He would spend most of the time copying the slides. In between, he will bite his nails. 
If the lecture took forever to end, he would play minesweeper on his phone. 
If he's bored, he would watch snapchat stories. He never accessed his facebook/instagram during lectures. I'm pretty sure he has an instagram account. But who uses snapchat these days when you have 'instastory'?


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