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Kyle Schwartz, a third grade teacher at Doull Elementary School in Denver, Colorado, asked her students to complete one simple sentence, "I wish my teacher knew..."
The answers were as surprising as they were heartbreaking.
Bored Panda compiled a list of the most memorable answers.
Ms. Schwartz has published a book titled "I Wish My Teacher Knew: How One Question Can Change Everything For Our Kids."
See what the kids said in the gallery.