Euclidean geometry is the study of points, lines, planes, and other geometric figures. The most prolonged argument over time has been that of the parallel postulate which states: there can only be one line that contains a given point and is parallel to another line.
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The Colosseum was an arena for the gladiatorial games . These were poplar among the Romans, but were not in keeping with he beliefs of Christians. Several bans of the gladiatorial games by Christian emperor were unsuccessful. However, as the Roman civilisation decayed and Christian beliefs became deeper among the population, they disappeared and the Colosseum fell out of use.
Yes, many people have bifocals.
it was invented in 100 B.Cand is still being used today
Patricians and plebeians were two ancient Roman social classes. The only effect they have on our life today is in our vocabulary such as "patrician" being used as an adjective meaning high class and "plebeian" being used as an adjective meaning low classed.
The actual type of napalm used during the Vietnam War is not being used. A derivative is currently within the US inventory; and can be deployed in accordance with the guidelines placed upon it by the UN Convention of 1980.