The Manhattan Project, the massive Allied effort that led to the invention of the atomic bomb in World War II, is the topic of an Oct. 18 lecture as part of Heritage Sandy Springs’ “Americans at War” series.

Fred Lehrer will discuss the history of the development of the atomic bomb and the United States’ controversial use of the nuclear weapon on Japanese cities.

The free lecture runs 6:30 to 7:30 p.m. at Heritage Sandy Springs Community Room, 6110 Blue Stone Road. For more information about the “Americans at War” series, see the website here.