Questions over alleged assassination attempt in Venezuela, the letter X, help for California firefighters

Questions over alleged assassination attempt in Venezuela, the letter X, help for California firefighters

Monday marks the 73rd anniversary since the US dropped an atomic bomb on Hiroshima. We meet one of the survivors who dedicated his life to finding the truth about the number of people who died in the bombing. Also, was it a coup plot behind an attempted assassination of Venezuelan leader Nicolas Maduro? And, we learn about the letter X. It's all part of a week-long series on language and social change.