Photographer Lewis Wickes Hine went undercover in factories and mines to expose the injustices of child labor.

The oculus of the Pantheon is

a. a central circular opening at the top of the dome. b. the round supportive structure under the dome. c. the sunken panels of the interior. d. the original dedication of the Pantheon.

Machaut's Mass is the first cyclic Mass, the first complete polyphonic setting of the Ordinary of the Mass, and is by far the longest polyphonic composition before the fifteenth century

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