Officials insist there is no "credible" evidence tying the school's location to the illnesses.
American Federation of Teachers President Randi Weingarten said it was "the height of hypocrisy" for DeVos to criticize teachers.
"If I have an aggressive kid in my class and he gets a hold of my gun, what then?" asked one teacher.
"What [senators] voted for yesterday is to introduce guns into the everyday reality of school. It's going to increase the risk of gunfire and casualty in schools, not decrease it," Fred Guttenberg told Newsweek.
"Say it with me, and be loud for the folks in the back row: The American public does NOT approve of arming teachers," said a pollster and former teacher.
The pair bullied the 14-year-old by saying one classmate was his boyfriend.
"I'm very concerned about the carry and storage of these weapons. And we think that's one of the reasons why we think this legislation is worrisome."
The collage included the words "ha ha" alongside two nooses and a smiley face.
From air traffic controllers to teachers, public workers with the informal power not to work are becoming a new force in American politics.
The Denver Classroom Teachers Association overwhelmingly voted to authorize a walkout earlier this week.
The dog—reportedly a pit bull terrier—bit a number of children after it got loose during the recess of third and fourth graders.
World Teachers' Day has been celebrated since 1994.
A coalition that includes gun control advocates and educators is prepared to sue the Education Department if it moves forward with a measure to use federal funds to arm teachers.
The pass rate "dramatically" fell after adopting exams by Pearson publishing company, hitting 54.5 percent in the 2016-17 school year.
President Donald Trump was in Texas Thursday to "listen" and "learn" from families of the victims of a recent school shooting in Santa Fe.
You could argue they deserve these discounts all year round.
Trump avoided using word "refugees" or "immigrants" while handing award to teacher who works with newly arrived children.
One student showed "real and identifiable symptoms of having been traumatized," a social worker said.
"This is a symbolic way for the students to participate in their actual education."
Allowing teachers to have access to firearms at school became a national issue after President Donald Trump advocated it in response to the Feb. 14 massacre of 17 at a Parkland, Florida, high school.
Sixty-three percent of TEACH recipients from 2014 had their grants turn into loans "that they never intended to borrow."