One night last week, Megan Maybray was panicking.A Holocaust survivor named Rita Ross was visiting her school, Kennett Middle School near Philadelphia, the next day, but Maybray was having trouble teaching her ESL students about the Holocaust. Her students are new arrivals to the United States and most know little English. Maybray had never really taught the Holocaust before and could tell that her previous attempt to introduce them to the basics had not had much of an impact.