The problem: Answer a question about this article:
Besides the bit rate of an encoded piece of audio, the quality of MP3 files also depends on the quality of the encoder itself, and the difficulty of the signal being encoded. As the MP3 standard allows quite a bit of freedom with encoding algorithms, different encoders may feature quite different quality, even with identical bit rates. As an example, in a public listening test featuring two different MP3 encoders at about 128 kbit/s, one scored 3.66 on a 1–5 scale, while the other scored only 2.22.
As a result of the freedom, different encoders can result in different quality even if which aspect of the file is the same?
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The answer: bit rates


The problem: Answer a question about this article:
From his early years, Bell showed a sensitive nature and a talent for art, poetry, and music that was encouraged by his mother. With no formal training, he mastered the piano and became the family's pianist. Despite being normally quiet and introspective, he reveled in mimicry and "voice tricks" akin to ventriloquism that continually entertained family guests during their occasional visits. Bell was also deeply affected by his mother's gradual deafness, (she began to lose her hearing when he was 12) and learned a manual finger language so he could sit at her side and tap out silently the conversations swirling around the family parlour. He also developed a technique of speaking in clear, modulated tones directly into his mother's forehead wherein she would hear him with reasonable clarity. Bell's preoccupation with his mother's deafness led him to study acoustics.
What part of his mom's head would Bell talk into?
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The answer: forehead


The problem: Answer a question about this article:
Pentecostalism eventually spawned hundreds of new denominations, including large groups such as the Assemblies of God and the Church of God in Christ, both in the United States and elsewhere. There are over 279 million Pentecostals worldwide, and the movement is growing in many parts of the world, especially the global South. Since the 1960s, Pentecostalism has increasingly gained acceptance from other Christian traditions, and Pentecostal beliefs concerning Spirit baptism and spiritual gifts have been embraced by non-Pentecostal Christians in Protestant and Catholic churches through the Charismatic Movement. Together, Pentecostal and Charismatic Christianity numbers over 500 million adherents.
How many Pentecostals are there in the world?
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The answer: over 279 million


The problem: Answer a question about this article:
In the early 20th century several mandolin orchestras (Estudiantinas) were active in Belgium. Today only a few groups remain: Royal Estudiantina la Napolitaine (founded in 1904) in Antwerp, Brasschaats mandoline orkest in Brasschaat and an orchestra in Mons (Bergen). Gerda Abts is a well known mandolin virtuoso in Belgium. She is also mandolin teacher and gives lessons in the music academies of Lier, Wijnegem and Brasschaat. She is now also professor mandolin at the music high school “Koninklijk Conservatorium Artesis Hogeschool Antwerpen”. She also gives various concerts each year in different ensembles. She is in close contact to the Brasschaat mandolin Orchestra. Her site is www.gevoeligesnaar.be
What groups remain today? 
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The answer:
Royal Estudiantina la Napolitaine (founded in 1904) in Antwerp, Brasschaats mandoline orkest in Brasschaat and an orchestra in Mons (Bergen).