A relative humidity level between 40% and 50% is generally considered to be the most comfortable. Anywhere from 30% to 60% is acceptable, but ideally you want to avoid the extremes of that range.
Ancient Greek civilization began around 1600 BC, at Mycenae and in Crete. It ended with the annexation of Greece by Rome in 146 BC. It was at its height around 431 BC, when the Peloponnesian War between Sparta and Athens began.
Overview and Timeline. The civilization of Ancient Egypt was one of the earliest in world history. It is usually held to have begun around 3000 BC, when the lower Nile Valley became unified under a single ruler.his period of history, between the civilization's beginnings in c. 3000 BC to its conquest by the Romans in 31 BC, was almost a thousand years longer than the period between 31 BC and the present day.