." >> next, author pamela scott cusses her book "capital engineers: the u.s. army corps of engineers in the development of washington, d.c., 1790-2004." we will hear about the army corps of engineers key role in designing the capital's elite -- the capital city, including the aqueduct bridge over the potomac river. this was hosted by the smithsonian associates. it is one hour and 45 minutes. mader program tonight is possible by generous underwritingby the reva and david logan foundation. they have enabled us to bump up our curriculum in that area. we have not offered a lot of local d.c. programs. so thank you very much. if you're not a member of this missoni and associates, your membership and your donation -- of thelp bring sony and associates, your member -- of the smithsonian associates, your membership and donation support help brings these