AdvertisementTeaching 2.0: Is Tech In The Classroom Worth The Cost?March 03, 2013facebookEmailStudents at Westlake High School in Waldorf, Md., participate in an interactive digital conversation with historian Kenneth C. Davis about late 19th and early 20th century American history on Thursday. The school uses a state of the art "telepresence center" for students to connect with experts all over the world. (Celeste Headlee)