Batman's Treaty with the Aborigines was annulled by the New South Wales governor (who at the time governed all of eastern mainland Australia), with compensation paid to members of the association. In 1836, Governor Bourke declared the city the administrative capital of the Port Phillip District of New South Wales, and commissioned the first plan for the city, the Hoddle Grid, in 1837. The settlement was named Batmania after Batman. However, later that year the settlement was named "Melbourne" after the British Prime Minister, William Lamb, 2nd Viscount Melbourne, whose seat was Melbourne Hall in the market town of Melbourne, Derbyshire. On 13 April 1837 the settlement's general post office officially opened with that name.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): On what date did the official general post office open?
Ah, so.. 13 April 1837

The term high definition once described a series of television systems originating from August 1936; however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution. The ongoing competition between companies and nations to create true "HDTV" spanned the entire 20th century, as each new system became more HD than the last.In the beginning of the 21st century, this race has continued with 4k, 5k and current 8K systems.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The term "high definition" originally described vcrs from what year?
Ah, so.. unanswerable

The Sumerians were a non-Semitic caucasoid people, and spoke a language isolate; a number of linguists believed they could detect a substrate language beneath Sumerian, because names of some of Sumer's major cities are not Sumerian, revealing influences of earlier inhabitants. However, the archaeological record shows clear uninterrupted cultural continuity from the time of the early Ubaid period (5300 4700 BC C-14) settlements in southern Mesopotamia. The Sumerian people who settled here farmed the lands in this region that were made fertile by silt deposited by the Tigris and the Euphrates rivers.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Why were the lands in the region the Sumerian people settled fertile?
Ah, so..
silt deposited by the Tigris and the Euphrates rivers