The first domestic microwave oven is introduced. Walk into almost any American kitchen today and there's one appliance that is likely to be sitting on the counter somewhere — a microwave oven. The microwave oven didn't come from humble beginnings.
The only true option from the list would be that "<span>In time a fifth group was added to the caste system--the untouchables," since this was a later development and not an initial part of the system. </span>
Explanation: when the fall of fall of the Byzantine Empire in 1453 was over, the Russian Orthodox Church evolved into a semi-independent branch of Eastern Christianity. In 1589 the metropolitan of Moscow received the title of patriarch.
