When the U.S. and Israel launched the war against Iran on Feb. 28, President Donald Trump said one of the main objectives was to prevent Iran from building a nuclear weapon.
That has put a focus on Iran's stockpile of uranium and its program to convert this naturally occurring element into material that can sustain a nuclear reaction — a process called enrichment. Several key nuclear sites in Iran were attacked by the U.S. and Israel last summer, and again during the latest war.
