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Michael Phelps is considered the greatest Olympian of all time because of his unparalleled success and dominance in swimming. Phelps has won a total of 23 Olympic gold medals, the most by any athlete in history. He has set numerous world records and achieved remarkable feats, including winning eight gold medals in a single Olympics (2008 Beijing Games). His longevity and ability to consistently perform at the highest level make him a true legend in the Olympic Games.

Yemen is the correct answer because it is widely believed to be the country where coffee originated from. Yemen has a long history of coffee cultivation and trade, dating back to the 15th century. The coffee plant, Coffea arabica, is native to the region and was first cultivated and consumed in Yemen. From there, coffee spread to other parts of the world, including Ethiopia, which is also considered a significant origin of coffee. Italy and Sudan, on the other hand, have played roles in the coffee trade and culture, but they are not the original sources of the coffee drink.

Greece is considered as the base of Western civilization due to its significant contributions in various fields such as philosophy, democracy, literature, art, and science. Ancient Greek philosophers like Socrates, Plato, and Aristotle laid the foundation for critical thinking and rational inquiry. The democratic system of governance originated in Athens, Greece. Greek literature and drama, including the works of Homer and Sophocles, have had a profound influence on Western literature. Greek architecture and sculpture set the standards for Western art. Therefore, Greece's cultural and intellectual achievements have greatly shaped and influenced Western civilization.

The first fashion doll was created in Germany, which later on inspired the creation of the Barbie doll.

The Opera was born in Florence. Florence is known as the birthplace of the Opera, as it was in this city that the first recorded opera performance took place in the late 16th century. The opera genre then spread to other parts of Italy and eventually to other countries. Florence's rich cultural and artistic history, along with the patronage of the Medici family, played a significant role in the development and popularization of the Opera.

The Norsemen invaders in Constantinople were called Varangians. The Varangians were a group of Scandinavian warriors who served as mercenaries in the Byzantine Empire. They were known for their skills in warfare and were sought after by the Byzantine emperors for their loyalty and military prowess. The Varangians played a significant role in the defense and protection of Constantinople, as well as in various military campaigns and expeditions undertaken by the Byzantines.

There are 54 countries in the continent of Africa. This is the correct answer because Africa is made up of 54 recognized sovereign nations. Each of these countries has its own government, borders, and international recognition. Therefore, the total number of countries in Africa is 54.

The tiger is the biggest feline of them all. Tigers are known for their large size and can weigh up to 660 pounds. They are also the longest among the big cats, with males reaching up to 10 feet in length. Tigers have a muscular build and are known for their strength and agility. They are apex predators and are capable of taking down large prey. With their impressive size and power, tigers rightfully hold the title of the biggest feline.

Nero is said to have burned down the city-state of Rome for his own profit. He was the Roman emperor who ruled from 54 to 68 AD. Nero's reign was marked by his extravagant lifestyle and erratic behavior. The Great Fire of Rome in 64 AD was a devastating event that destroyed a large part of the city. While it is debated whether Nero was directly responsible for starting the fire, he took advantage of the situation to clear land for his grandiose building projects and blamed the Christians for the fire, leading to their persecution.

Most African countries acquired their independence in the 1960s. This was a significant period in history known as the "African decolonization wave" where many African nations gained independence from their colonial rulers. The 1960s marked a turning point in the continent's history as numerous countries, including Nigeria, Ghana, Kenya, and Tanzania, achieved sovereignty and self-governance. This period saw a surge in nationalist movements and a desire for independence among African nations, leading to the decolonization process.