“A person walking into a genial classroom knows almost at once that it is a place dedicated to the celebration of learning and young minds; a cognitive greenhouse, so to speak, that honors and celebrates the capacities of each and every student. In a genial classroom, there are frequent outbursts of energy representing students' exuberance in discovering something new, in making novel connections, in confronting and overcoming challenges, in being surprised or delighted, intrigued or mystified, and indignant or outspoken about the ideas and materials being presented.”