Areas of the cortex located just behind the temples containing the neurons responsible for the sense of hearing and meaningful speech. Frontal Lobes Areas of the cortex located in the front and top of the brain, responsible for higher mental processes and decision making as well as the production of fluent speech.
As a practical matter, some might argue, if a filibuster is threatened and it takes 60 votes to end debate in the Senate, then it does take 60 votes to pass a bill. Nothing in the Constitution says that a three-fifths majority is necessary to pass ordinary legislation.
50% of 100 is 50. A simple majority is 50% + 1, thus the fewest yea votes required for an ordinary bill to pass the US Senate is 51.   For several months during 2009, Minnesota had only 1 Senator as Candidate Al Franken was not seated due to the close election. Therefore, the US Senate had only 99 seated Senators.