What is the historical reason for 18 years being the most commonly accepted age of adulthood?

Most countries define the age of adulthood at 18 years. Why is this? Was there some historical precedent set in ancient Rome/Greece or something like that? Why 18 years and not some "nicer" number... more

Historical, academic explanations for the near-universal second-class citizenship of women?

I just heard on the news that, in 70 countries, girls face risks by simply going to school and being girls. How did women come to be second-class citizens throughout the world? Are there any... more

humanism was the revival of the study of arts and sciences

                                                                                                            art

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