Like the Romans used to drink from lead cups. Something like that.
(it appears that the moderator is removing any replies with which he disagrees. It might be a piefed issue. But all the removed replies are top level and upopular. Stranger coincidences have happened I suppose.)
Good luck with that. The teacher is the one explaining incomprehensibly in the first place.
Also true. Although for school-grade knowledge, there’s probably a reputable guy on YouTube who will explain your topic in 15 minutes.