Context and question: Time appears to have a direction—the 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?
Answer: arbitrary
Context and question: Approximately 10,000 years ago, desertification forced hunter-gatherer societies south into the Sahel regions of northern Central Africa, where some groups settled and began farming as part of the Neolithic Revolution. Initial farming of white yam progressed into millet and sorghum, and before 3000 BC the domestication of African oil palm improved the groups' nutrition and allowed for expansion of the local populations. Bananas arrived in the region and added an important source of carbohydrates to the diet; they were also used in the production of alcoholic beverages.[when?] This Agricultural Revolution, combined with a "Fish-stew Revolution", in which fishing began to take place, and the use of boats, allowed for the transportation of goods. Products were often moved in ceramic pots, which are the first known examples of artistic expression from the region's inhabitants.
What did a Fish-stew revolution do to the group's eating habits?
Answer: unanswerable
Context and question: Ford Motor Company and Coca-Cola were two of the first sponsors of American Idol in its first season. The sponsorship deal cost around $10 million in season one, rising to $35 million by season 7, and between $50 to $60 million in season 10. The third major sponsor AT&T Wireless joined in the second season but ended after season 12, and Coca-Cola officially ended its sponsorship after season 13 amidst the declining ratings of Idol in the mid-2010s. iTunes sponsored the show since season seven.
Who was the third largest sponsor?
Answer:
AT&T