This is an official civil defense film produced in co-operation with the Federal Civil Defense Administration and in consultation with the [bad word] of the National Education Association.

How can we tell when the atomic bomb may explode?
And the teacher is explaining that there are two kinds of attack: With warning and without any warning.

Duck and cover!

We all know that the atmoic bomb is very dangerous. And if it's used against us, we must get ready for it as we are ready for any other dangers that surround as all the time.