Why I hate "I don't know"

Me: "What did you do at school today, Jordon?"

Jordon: "I don't know."

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Me: "Emily, where did all the candy canes go?"

Emily: "I don't know. "

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Me: "Jordon, do you have homework?"

Jordon: "I don't know."

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Me: "Honey, what do you want for Christmas this year?"

Hubby: "I don't know."

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Me: "Jess, do you have the $20 I loaned you last week?"

Jess: "I don't know."