David Ruiz is a menace to the students.No one wants to study what he teaches. He is killing the young minds of the students and if they don't study they are gonna fail and if they fail they won't get a job if they don't get a job they will be homeless if they are homeless they are gonna do drugs and that would be harmful to society. so I ask everyone to please change David Ruiz as the lecturer for physics 1 of the foundation year not for the students but for the welfare of society.