Odd

Digital art by Katherine

My sister liked solving 40 quadratic equations every morning when she was 12  but she had no idea why they existed and why children should learn them.
That seems odd to me.

Then we have odd numbers but no normal number, just even ones

Why are odd numbers called odd?

If we take away all whol numbers from the set of all real numbers there are still more numbers left behind than the number we removed.Infinity has sizes!