Question: Most hunter-gatherers are nomadic or semi-nomadic and live in temporary settlements. Mobile communities typically construct shelters using impermanent building materials, or they may use natural rock shelters, where they are available.
Is there an answer to this question: Few hunter-gatherers live in what kind of settlements?

Answer: unanswerable


Question: In principle, the Planck constant could be determined by examining the spectrum of a black-body radiator or the kinetic energy of photoelectrons, and this is how its value was first calculated in the early twentieth century. In practice, these are no longer the most accurate methods. The CODATA value quoted here is based on three watt-balance measurements of KJ2RK and one inter-laboratory determination of the molar volume of silicon, but is mostly determined by a 2007 watt-balance measurement made at the U.S. National Institute of Standards and Technology (NIST). Five other measurements by three different methods were initially considered, but not included in the final refinement as they were too imprecise to affect the result.
Is there an answer to this question: What year was the measurement for the Planck constant value avoided?

Answer: unanswerable


Question: In the later 1890s and into first decade of the 20th century, structural changes occurred in the operation of the Pacific trading companies; they moved from a practice of having traders resident on each island to instead becoming a business operation where the supercargo (the cargo manager of a trading ship) would deal directly with the islanders when a ship visited an island. From 1900 the numbers of palagi traders in Tuvalu declined and the last of the palagi traders were Fred Whibley on Niutao, Alfred Restieaux on Nukufetau, and Martin Kleis on Nui. By 1909 there were no more resident palagi traders representing the trading companies, although both Whibley and Restieaux remained in the islands until their deaths.
Is there an answer to this question: What type of traders did the Pacific trading companies cease to use?

Answer: resident


Question: The hole walls for boards with two or more layers can be made conductive and then electroplated with copper to form plated-through holes.  These holes electrically connect the conducting layers of the PCB. For multi-layer boards, those with three layers or more, drilling typically produces a smear of the high temperature decomposition products of bonding agent in the laminate system. Before the holes can be plated through, this smear must be removed by a chemical de-smear process, or by plasma-etch. The de-smear process ensures that a good connection is made to the copper layers when the hole is plated through. On high reliability boards a process called etch-back is performed chemically with a potassium permanganate based etchant or plasma. The etch-back removes resin and the glass fibers so that the copper layers extend into the hole and as the hole is plated become integral with the deposited copper.
Is there an answer to this question: The process used on low-reliability boards is called what?

Answer:
unanswerable