Children jokes: What is the chemical formula for water? Pupil: #28

Teacher: "What is the chemical formula for water?" —Pupil: "HIJKLMNO!" Teacher: "What are you talking about?" —Pupil: "Yesterday you said it's H to O"
Teacher: "What is the chemical formula for water?" Pupil: "HIJKLMNO!" Teacher: "What are you talking about?" Pupil: "Yesterday you said it's H to O"
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