Mary and John are in the same school and they really enjoy learning.

They are just kids, but when they have a problem, they shouldn't panic...

Mary is very calm and her classmates often ask her for help in solving simple problems of everyday life. Like the time one of her classmates couldn't pack her backpack and she was getting nervous because of this. Mary emptied it and then together they filled it again. First the large objects, books and notebooks vertically and then everything else. Problem solved.