Pieces of World War II history have arrived in Tulsa and are on display at the Tulsa Air and Space Museum, including FiFi, which is one of only two Boeing B-29 Superfortresses still flying.

Hours after North Korea said it successfully set off a hydrogen bomb in its sixth nuclear test, President Trump took aim at the nation in a series of tweets, calling its words and actions "hostile and dangerous" to the United States. 

Given North Korea's steady progress in  building nuclear weapons, it is no longer possible to simply dismiss its threats of destroying American cities and military bases as mere bluster.