Read "Wet Magic" by Edith Nesbit online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
As the children passed through the golden doors a sort of swollen feeling which was beginning to make their heads quite uncomfortable passed away, and left them with a curiously clear and comfortable certainty that they were much cleverer than usual.
"I could do sums now, and no mistake," Bernard whispered to Kathleen, who replied to the effect that dates no longer presented the slightest difficulty to her.