Because the Jihad.
With lots of drafts
From trying to blow out lightbulbs.
Student: "HIJKLMNO." Teacher: "What are you talking about " Student: "Yesterday you said it's H to O!"
Student: H, I, J, K, L, M, N, O. Teacher: That's not what I taught you. Student: But you said the formula for water was...H to O.
Allahu Snackbar!