[Eternal Student (OP)]

Hi.
   Thanks for another podcast. 

What was Good?     Interaction with a school.

What was worrying?   How do you decide where to stop an answer and how much to simplify?
   Let's ignore some of the advanced topics, they need simplification.  However, the question about circles could have been answered differently and probably wouldn't have confused too many children.
Perfect circles do not exist in reality, only in abstract geometry.  They know this, children have used a compass and they know that no matter how careful you are, it never quite works.

Best Wishes.

[chris]

Thank you.