QUES: NARA also maintains the Presidential Library system, a nationwide network of libraries for preserving and making available the documents of U.S. presidents since Herbert Hoover. The Presidential Libraries include:
What is the system that Herbert Hoover founded?

ANS: unanswerable

QUES: "Digimon" are "Digital Monsters". According to the stories, they are inhabitants of the "DigiWorld", a manifestation of Earth's communication network. The stories tell of a group of mostly pre-teens, who accompany special Digimon born to defend their world (and ours) from various evil forces. To help them surmount the most difficult obstacles found within both realms, the Digimon have the ability to evolve (Digivolve) In this process, the Digimon change appearance and become much stronger, often changing in personality as well. The group of children who come in contact with the Digital World changes from series to series.
What is a manifestation of a world far from work?

ANS: unanswerable

QUES: A new style of wafers composed of gallium-nitride-on-silicon (GaN-on-Si) is being used to produce white LEDs using 200-mm silicon wafers. This avoids the typical costly sapphire substrate in relatively small 100- or 150-mm wafer sizes. The sapphire apparatus must be coupled with a mirror-like collector to reflect light that would otherwise be wasted. It is predicted that by 2020, 40% of all GaN LEDs will be made with GaN-on-Si. Manufacturing large sapphire material is difficult, while large silicon material is cheaper and more abundant. LED companies shifting from using sapphire to silicon should be a minimal investment.
What needs to not be used to reflect light that would otherwise be wasted?

ANS: unanswerable

QUES: Atticus does not want Jem and Scout to be present at Tom Robinson's trial. No seat is available on the main floor, so by invitation of Rev. Sykes, Jem, Scout, and Dill watch from the colored balcony. Atticus establishes that the accusers—Mayella and her father, Bob Ewell, the town drunk—are lying. It also becomes clear that the friendless Mayella made sexual advances toward Tom, and that her father caught her and beat her. Despite significant evidence of Tom's innocence, the jury convicts him. Jem's faith in justice becomes badly shaken, as is Atticus', when the hapless Tom is shot and killed while trying to escape from prison.
Where do Jem, Scout, and Dill observe the trial of Tom Robinson?

ANS:
balcony