Problem: MP3:

Compression efficiency of encoders is typically defined by the bit rate, because compression ratio depends on the bit depth and sampling rate of the input signal. Nevertheless, compression ratios are often published. They may use the Compact Disc (CD) parameters as references (44.1 kHz, 2 channels at 16 bits per channel or 2×16 bit), or sometimes the Digital Audio Tape (DAT) SP parameters (48 kHz, 2×16 bit). Compression ratios with this latter reference are higher, which demonstrates the problem with use of the term compression ratio for lossy encoders.

What can CD parameters be used as references for?
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A: compression ratios


Problem: Tajikistan:

As a landlocked country Tajikistan has no ports and the majority of transportation is via roads, air, and rail. In recent years Tajikistan has pursued agreements with Iran and Pakistan to gain port access in those countries via Afghanistan. In 2009, an agreement was made between Tajikistan, Pakistan, and Afghanistan to improve and build a 1,300 km (810 mi) highway and rail system connecting the three countries to Pakistan's ports. The proposed route would go through the Gorno-Badakhshan Autonomous Province in the eastern part of the country. And in 2012, the presidents of Tajikistan, Afghanistan, and Iran signed an agreement to construct roads and railways as well as oil, gas, and water pipelines to connect the three countries.

In 2019, an agreement was made between what three countries?
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A: unanswerable


Problem: Apollo:

The etymology of the name is uncertain. The spelling Ἀπόλλων (pronounced [a.pól.lɔːn] in Classical Attic) had almost superseded all other forms by the beginning of the common era, but the Doric form Apellon (Ἀπέλλων), is more archaic, derived from an earlier *Ἀπέλjων. It probably is a cognate to the Doric month Apellaios (Ἀπελλαῖος), and the offerings apellaia (ἀπελλαῖα) at the initiation of the young men during the family-festival apellai (ἀπέλλαι). According to some scholars the words are derived from the Doric word apella (ἀπέλλα), which originally meant "wall," "fence for animals" and later "assembly within the limits of the square." Apella (Ἀπέλλα) is the name of the popular assembly in Sparta, corresponding to the ecclesia (ἐκκλησία). R. S. P. Beekes rejected the connection of the theonym with the noun apellai and suggested a Pre-Greek proto-form *Apalyun.

Apellon is derived from what Doric month?
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A: Apellaios


Problem: Beyoncé:

In January 2013, Destiny's Child released Love Songs, a compilation album of the romance-themed songs from their previous albums and a newly recorded track, "Nuclear". Beyoncé performed the American national anthem singing along with a pre-recorded track at President Obama's second inauguration in Washington, D.C. The following month, Beyoncé performed at the Super Bowl XLVII halftime show, held at the Mercedes-Benz Superdome in New Orleans. The performance stands as the second most tweeted about moment in history at 268,000 tweets per minute. At the 55th Annual Grammy Awards, Beyoncé won for Best Traditional R&B Performance for "Love on Top". Her feature-length documentary film, Life Is But a Dream, first aired on HBO on February 16, 2013. The film, which she directed and produced herself, featured footage from her childhood, her as a mother and businesswoman, recording, rehearsing for live performances, and her return to the spotlight following Blue Ivy's birth. Its DVD release in November 2013 was accompanied by footage from the Revel Presents: Beyoncé Live concerts and a new song, "God Made You Beautiful". In February 2013, Beyoncé signed a global publishing agreement with Warner/Chappell Music, which would cover her future songwriting and then-upcoming studio album.

What event did Beyoncé perform at one month after Obama's inauguration? 
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A:
Super Bowl XLVII halftime show