Can someone annotate this poem, pls? for my AP English class, an assignment do tomorrow!?

The History Teacher - Billy Collins Trying to protect his students' innocence he told them the Ice Age was really just the Chilly Age, a period of a million years when everyone had to wear sweaters. And the Stone Age became the Gravel Age, named after the long driveways of the time. The Spanish Inquisition was nothing more than an outbreak of questions such as "How far is it from here to Madrid?" "What do you call the matador's hat?" The War of the Roses took place in a garden, and the Enola Gay dropped one tiny atom on Japan. The children would leave his classroom for the playground to torment the weak and the smart, mussing up their hair and breaking their glasses, while he gathered up his notes and walked home past flower beds and white picket fences, wondering if they would believe that soldiers in the Boer War told long, rambling stories designed to make the enemy nod off.

Answer 1: Wow. I see no errors.

Answer 2: The teacher's trying to cover up the harsh truths in human history for his students, but they're already living out cruelty in their own lives - he's not protecting their innocence at all, just avoiding discussions of human evil that exists in spite of his efforts to ignore it.