. >>> next on "lectures in history," georgetown university professor marcia chatelain talks about the different types of sex education used across the country in the 1950s and why such courses have become politically divisive today. she compares sex ed programs in oregon, new jersey and california and explores how they were often used to instill gender norms and racial divides. her class is about an hour and ten minutes. >>> so my former employer, university of oklahoma, where i worked before i came to georgetown, has had a lot of attention lately for a number of reasons. i think it's an interesting situation. so a group of students were caught on camera -- or caught on camera phone, rather -- singing a racist song about lynching and the students immediately were expelled from the university by president david borne of the university of oklahoma. is anyone troubled by the singular action of president boren? is anyone troubled that a university president has expelled students unilaterally? >> yes. >> yes, absolutely. i think, i mean, these things come up a lot in our, you know, quick r