"Paper," Lin Nianhe said without looking up.
"What paper?"
"Long-term harm and effects of heavy metal poisoning on humans and the environment," Lin Nianhe finally glanced at him and asked, "Do you understand?"
Sie Yufei widened his eyes, and without restraining himself, hammered with a loud thud, "Who do you think you're looking down on? Just because I didn't choose science in the college entrance exam doesn't mean I know nothing about physics!"
Lin Nianhe: "This is chemistry and biology."
Sie Yufei: "..."
"Congratulations, in a two out of three chance, you picked the only wrong answer."
"..."
"Just focus on hammering the wall."
"...Alright."
Sie Yufei sulked while he hammered the wall, pondering about life—should he find a tutor to learn basic science knowledge?
After nearly an hour, Lin Nianhe put down her pen, stretched, and went over to the sleepy Sie Yufei with a box of marbles. "Here."
Sie Yufei rubbed his eyes and looked at her confused, "What for?"
