Question: The central part of the Sahara is hyperarid, with little to no vegetation. The northern and southern reaches of the desert, along with the highlands, have areas of sparse grassland and desert shrub, with trees and taller shrubs in wadis where moisture collects. In the central, hyperarid part, there are many subdivisions of the great desert such as the Tanezrouft, the Tenere, the Libyan Desert, the Eastern Desert, the Nubian Desert and others. These absolute desert regions are characterized by their extreme aridity, and some years can pass without any rainfall.
Is there an answer to this question: What areas are characterized by frequent rains?

Answer: unanswerable

Question: Some historians estimate the number of magnates as 1% of the number of szlachta. Out of approx. one million szlachta, tens of thousands of families, only 200300 persons could be classed as great magnates with country-wide possessions and influence, and 3040 of them could be viewed as those with significant impact on Poland's politics.
Is there an answer to this question: Out of one million how many people could be viewed with significant impact politically?

Answer: 3040

Question: Hydrogen has three naturally occurring isotopes, denoted 1H, 2H and 3H. Other, highly unstable nuclei (4H to 7H) have been synthesized in the laboratory but not observed in nature.
Is there an answer to this question: Which isotopes have unstable nuclei?

Answer: 4H to 7H

Question: Title IV of the 1978 Spanish constitution invests the Consentimiento Real (Royal Assent) and promulgation (publication) of laws with the monarch of Spain, while Title III, The Cortes Generales, Chapter 2, Drafting of Bills, outlines the method by which bills are passed. According to Article 91, within fifteen days of passage of a bill by the Cortes Generales, the sovereign shall give his or her assent and publish the new law. Article 92 invests the monarch with the right to call for a referendum, on the advice of the president of the government (commonly referred to in English as the prime minister) and the authorisation of the cortes.
Is there an answer to this question: Which article specifies the number of days available to the monarch to provide a signature on an assended bill?

Answer:
Article 91