Student A:Context: "Take That Look Off Your Face" is the title of a hit song by musical theatre composer Andrew Lloyd Webber. Collaborating with lyricist Don Black, it was written for the song cycle show Tell Me on a Sunday in 1978. It was sung and released by Marti Webb in 1980, and became a No. 3 hit in the UK charts. The song was also popular in Ireland, and spent six weeks at number one. Later, Tell Me on a Sunday was combined with another Lloyd Webber work, Variations, to form an entire new show, Song and Dance.

Question: who sang take that look off your face?
Student B:OK... To answer the question, consider the following: It was sung and released by Marti Webb in 1980, and became a No. 3 hit in the UK charts.
Marti Webb.

Student A:The Greatest Showman is a 2017 American musical film directed by Michael Gracey in his directorial debut, written by Jenny Bicks and Bill Condon and starring Hugh Jackman, Zac Efron, Michelle Williams, Rebecca Ferguson, and Zendaya. The film is inspired by the story of P.T. Barnum's creation of the Barnum & Bailey Circus and the lives of its star attractions.

Who is the movie the greatest showman based on?
Student B:OK... To answer this question, we should know that: The film is inspired by the story of P.T. Barnum's creation of the Barnum & Bailey Circus and the lives of its star attractions.
P.T. Barnum.

Student A:First recorded in the 1860s, the proverb originated in Wales, and was particularly prevalent in Pembrokshire. The first English version of the saying was "Eat an apple on going to bed, and you'll keep the doctor from earning his bread." The current phrasing ("An apple a day keeps the doctor away") was first used in print in 1922.

Answer this question: where does an apple a day keeps the doctor away come from?
Student B:OK... The important part for answering this question is: First recorded in the 1860s, the proverb originated in Wales, and was particularly prevalent in Pembrokshire.
Wales.

Student A:The apparent magnitude (m) of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth. The brighter an object appears, the lower its magnitude value (i.e. inverse relation). The Sun, at apparent magnitude of 27, is the brightest object in the sky. It is adjusted to the value it would have in the absence of the atmosphere. Furthermore, the magnitude scale is logarithmic; a difference of one in magnitude corresponds to a change in brightness by a factor of 100, or about 2.512.

Based on this passage, the apparent visual magnitude of a star is a measure of the star's?
Student B:
OK... The relevant sentence in the passage is: The apparent magnitude (m) of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
brightness as seen by an observer on Earth.