Scholars look for clues using these means: books, architectures, artifacts and legends.
Books are the most useful sources of clues, they are rich in information that are reliable and which can be totally depend on. The least useful are legends, information gather from this source may not be that reliable.
B. Justinian Plague
Pandemics are infectious disease outbreaks that affect a large proportion of the population across a large geographic area. There have been several pandemics in history. <em>The bubonic plague that ravaged Constantinople in the sixth century was called the Justinian Plague.</em> Many people have died as a result of today's AIDS pandemic. Because of this, economic productivity in some counties has declined. The avian flu has health professionals worried about the possibility of a future pandemic. Currently, the avian flu virus can spread from bird to bird and from birds to humans. The World Health Organization is helping nations to prepare for future outbreaks by encouraging them to invest in vaccine research and stockpile anti-viral medications.
The correct answer to this open question is the following.
Unfortunately, you did not include any references or context. However, we can help you answer in general terms.
A modern-day leader has to achieve success in any endeavor he got into. That is why he leads a group of people or an organization, to accomplish the established goals.
To do that, the leader has to lead by example, so he/she can convince its people to do what it asks for. Otherwise, people would have doubts and concerns if the leader is not capable to do what it is asking for. That is why the leader has to show common traits such as patience, courage, flexibility, creativity, dependability, teamwork, and perseverance.
Yes, Greece, who actually began the classical era.
The biggest factor was due to the amount of money that was poured into the vietnam war and people stopped investing into stocks due to it. avoidable? depends on who you ask but i’d say yes.