Problem: All vertebrates have a blood–brain barrier that allows metabolism inside the brain to operate differently from metabolism in other parts of the body. Glial cells play a major role in brain metabolism by controlling the chemical composition of the fluid that surrounds neurons, including levels of ions and nutrients.
What type of cells have a huge role in brain metabolism?
The answer is the following: Glial cells

Problem: In June 1963, Rev. Martin Luther King, Jr. gave a major speech in Detroit that foreshadowed his "I Have a Dream" speech in Washington, D.C. two months later. While the African-American Civil Rights Movement gained significant federal civil rights laws in 1964 and 1965, longstanding inequities resulted in confrontations between the police and inner city black youth wanting change. Longstanding tensions in Detroit culminated in the Twelfth Street riot in July 1967. Governor George W. Romney ordered the Michigan National Guard into Detroit, and President Johnson sent in U.S. Army troops. The result was 43 dead, 467 injured, over 7,200 arrests, and more than 2,000 buildings destroyed, mostly in black residential and business areas. Thousands of small businesses closed permanently or relocated to safer neighborhoods. The affected district lay in ruins for decades. It was the most costly riot in the United States.
Who was the President of the United States in 1967?
The answer is the following: President Johnson

Problem: The development of quadraphonic records was announced in 1971. These recorded four separate sound signals. This was achieved on the two stereo channels by electronic matrixing, where the additional channels were combined into the main signal. When the records were played, phase-detection circuits in the amplifiers were able to decode the signals into four separate channels. There were two main systems of matrixed quadraphonic records produced, confusingly named SQ (by CBS) and QS (by Sansui). They proved commercially unsuccessful, but were an important precursor to later surround-sound systems, as seen in SACD and home cinema today.
What did quadraphonic recording feature?
The answer is the following: recorded four separate sound signals.

Problem: 19 Recordings, a recording label owned by 19 Entertainment, currently hold the rights to phonographic material recorded by all the contestants. 19 originally partnered with Bertelsmann Music Group (BMG) to promote and distribute the recordings through its labels RCA Records, Arista Records, J Records, Jive Records. In 2005-2007, BMG partnered with Sony Music Entertainment to form a joint venture known as Sony BMG Music Entertainment. From 2008-2010, Sony Music handled the distribution following their acquisition of BMG. Sony Music was partnered with American Idol and distribute its music, and In 2010, Sony was replaced by as the music label for American Idol by UMG's Interscope-Geffen-A&M Records.
Who owns 19 Recordings?
The answer is the following:
19 Entertainment