Explanation:
Slavery in ancient Rome played an important role in society and the economy. Besides manual labor, slaves performed many domestic services, and might be employed at highly skilled jobs and professions. Accountants and physicians were often slaves. Slaves of Greek origin in particular might be highly educated.
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Slavery in ancient Rome - Wikipedia
It is the United States "Senate" that limits the president's ability to nominate federal judges, since one of the jobs of the Senate is to "confirm or deny" such appointments.
The philosophers during the middle ages believed that the geocentric model of the Universe was the one that is true. This model presupposed the Earth being the centre of the universe and the Sun revolving around the Earth - this, of course, isn't true.
