Nearly nothing. There are differences, but they are small.
Roman society took much from the Greeks when they conquered them. The Romans were more into war then the Greeks (more into the sciences).
Persia was a better place to be a woman than Greece, and they were accepted as professionals (in some cases) in Persia, while in Greece they were confined to the house. Woman were also more important (though still less then Persia) in the Roman Empire.
As well, slavery didn't matter as much in Persia as Rome and Greece.
All three worshipped Gods in what we would now call a pagan religion. The Gods were different but had the same idea.
Robert Kennedy was attorney general during his brother John F. Kennedy's administration.
As attorney general, he fought organized crime and was a key supporter of the Civil Rights Movement.
In 1953 Kennedy became an advisor to the Senate Subcommittee on Investigations under Senator Joseph McCarthy. Kennedy left the position just six months later, objecting to McCarthy’s unjust investigative tactics.
In 1960 Kennedy managed brother John’s presidential campaign. When JFK was elected, Robert was made U.S. attorney general and became one of JFK’s closest cabinet advisors. When JFK was assassinated in 1963, Robert resigned as attorney general the following September and announced his intent to run for a senate seat.
In 1968 Kennedy ran against Eugene McCarthy in the presidential election primaries. On June 5, 1968, following his victory speech at the California Democratic Primary at the Ambassador Hotel in Los Angeles, Kennedy was shot several times by gunman Sirhan Sirhan. He died the next day at age 42, his promising presidential administration over before it began.
