Explain how Mrs. Murry knows that Meg and her brother are very smart in A Wrinkle in Time.

At the beginning of the
book, Meg recalls that her father, before he went away, had told her that Charles Wallace had a
good mind and that Meg should not worry about him. Instead, Charles Wallace, like Meg, just did
things at his own pace. Meg thinks of herself as dumb, but her father reassured her that this
was not true. When she asked him how he knew that she was not dumb, her father told her that he
and his wife, Mrs. Murry, had played games with the children that were really tests of different
kinds. Among these "games" were IQ tests. Her father would not tell her what her IQ
was, but he said that she and Charles Wallace could do anything that they wanted to, given their
high intelligence.