Problem: Mosaic:

There were two main techniques in Greco-Roman mosaic: opus vermiculatum used tiny tesserae, typically cubes of 4 millimeters or less, and was produced in workshops in relatively small panels which were transported to the site glued to some temporary support. The tiny tesserae allowed very fine detail, and an approach to the illusionism of painting. Often small panels called emblemata were inserted into walls or as the highlights of larger floor-mosaics in coarser work. The normal technique was opus tessellatum, using larger tesserae, which was laid on site. There was a distinct native Italian style using black on a white background, which was no doubt cheaper than fully coloured work.

What was the benefit of using small pieces to create a mosaic?
---
A: very fine detail

Problem: Central Intelligence Agency:

The role and functions of the CIA are roughly equivalent to those of the United Kingdom's Secret Intelligence Service (the SIS or MI6), the Australian Secret Intelligence Service (ASIS), the Egyptian General Intelligence Service, the Russian Foreign Intelligence Service (Sluzhba Vneshney Razvedki) (SVR), the Indian Research and Analysis Wing (RAW), the Pakistani Inter-Services Intelligence (ISI), the French foreign intelligence service Direction Generale de la Securite Exterieure (DGSE) and Israel's Mossad. While the preceding agencies both collect and analyze information, some like the U.S. State Department's Bureau of Intelligence and Research are purely analytical agencies.[citation needed]

What is the acronym for French's intelligence service?
---
A: DGSE

Problem: Party leaders of the United States House of Representatives:

During this early period, it was more usual that neither major party grouping (Federalists and Democratic-Republicans) had an official leader. In 1813, for instance, a scholar recounts that the Federalist minority of 36 Members needed a committee of 13 "to represent a party comprising a distinct minority" and "to coordinate the actions of men who were already partisans in the same cause." In 1828, a foreign observer of the House offered this perspective on the absence of formal party leadership on Capitol Hill:

What did the Democratic-Republicans have in 1828?
---
A: unanswerable

Problem: Time:

Time appears to have a directionthe past lies behind, fixed and immutable, while the future lies ahead and is not necessarily fixed. Yet for the most part the laws of physics do not specify an arrow of time, and allow any process to proceed both forward and in reverse. This is generally a consequence of time being modeled by a parameter in the system being analyzed, where there is no "proper time": the direction of the arrow of time is sometimes arbitrary. Examples of this include the Second law of thermodynamics, which states that entropy must increase over time (see Entropy); the cosmological arrow of time, which points away from the Big Bang, CPT symmetry, and the radiative arrow of time, caused by light only traveling forwards in time (see light cone). In particle physics, the violation of CP symmetry implies that there should be a small counterbalancing time asymmetry to preserve CPT symmetry as stated above. The standard description of measurement in quantum mechanics is also time asymmetric (see Measurement in quantum mechanics).

The direction of the arrow of time is sometimes what?
---
A:
arbitrary