NEW YORK--Kerry Richardson likes that some of her fellow teachers at Richmond Public Schools in Virginia nicknamed her “ Walmart.” Others call the second grade teacher “ Boy Scout.” Yes, Richardson says with a laugh, she is always prepared to lend fellow teachers whatever they may need.... The teacher sends their thanks and gives evidence of what happened.... So that kind of directness really appeals to them.” The model--created in 2000 by Charles Best, who was teaching at a public high school