Student A:Passage: According to A&E's Biography, Bert and Ernie were virtually the only Muppets to appear in the Sesame Street pilot episode, which was screen tested to a number of families in July 1969. Their brief appearance was the only part of the pilot that tested well, so it was decided that not only should Muppet characters be the "stars" of the show, but would also interact with the human characters, something that was not done in the pilot.

Question: Based on this passage, when did bert and ernie first appear on sesame street?
Student B:OK... This is the relevant information: According to A&E's Biography, Bert and Ernie were virtually the only Muppets to appear in the Sesame Street pilot episode, which was screen tested to a number of families in July 1969.
July 1969.

Student A:The Beatles' rooftop concert was the final public performance of the English rock band the Beatles. On 30 January 1969, the band, with keyboardist Billy Preston, surprised a central London office and fashion district with an impromptu concert from the roof of the headquarters of the band's multimedia corporation Apple Corps at 3 Savile Row. In a 42-minute set, the Beatles were heard playing nine takes of five songs before the Metropolitan Police Service asked them to reduce the volume. Footage from the performance was later used in the 1970 documentary film Let It Be.

Answer this question based on the passage: where did the beatles final live performance take place?
Student B:OK... The relevant information is: On 30 January 1969, the band, with keyboardist Billy Preston, surprised a central London office and fashion district with an impromptu concert from the roof of the headquarters of the band's multimedia corporation Apple Corps at 3 Savile Row.
the roof of the headquarters of the band 's multimedia corporation Apple Corps at 3 Savile Row.

Student A:"Withering away of the state" is a Marxist concept coined by Friedrich Engels referring to the idea that, with realization of the ideals of socialism, the social institution of a state will eventually become obsolete and disappear, as the society will be able to govern itself without the state and its coercive enforcement of the law.

Who asserted that the state would ultimately wither away?
Student B:OK... To answer the question, consider the following: "Withering away of the state" is a Marxist concept coined by Friedrich Engels referring to the idea that, with realization of the ideals of socialism, the social institution of a state will eventually become obsolete and disappear, as the society will be able to govern itself without the state and its coercive enforcement of the law.
Friedrich Engels.

Student A:The corresponding vein that carries deoxygenated blood from the upper half of the body is the superior vena cava.

What is the function of the super vena cava?
Student B:
OK... To answer this question, we should know that: The corresponding vein that carries deoxygenated blood from the upper half of the body is the superior vena cava.
carries deoxygenated blood from the upper half of the body.