Problem: For example, consider electronpositron annihilation, in which the rest mass of individual particles is destroyed, but the inertia equivalent of the system of the two particles (its invariant mass) remains (since all energy is associated with mass), and this inertia and invariant mass is carried off by photons which individually are massless, but as a system retain their mass. This is a reversible process the inverse process is called pair creation in which the rest mass of particles is created from energy of two (or more) annihilating photons. In this system the matter (electrons and positrons) is destroyed and changed to non-matter energy (the photons). However, the total system mass and energy do not change during this interaction.
what is created and changed to non-matter energy?
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Answer: unanswerable

Problem: On May 29, 2008, government officials began inspecting the ruins of thousands of schools that collapsed, searching for clues about why they crumbled. Thousands of parents around the province have accused local officials and builders of cutting corners in school construction, citing that after the quake other nearby buildings were little damaged. In the aftermath of the quake, many local governments promised to formally investigate the school collapses, but as of July 17, 2008 across Sichuan, parents of children lost in collapsed schools complained they had yet to receive any reports. Local officials urged them not to protest but the parents demonstrated and demanded an investigation. Furthermore, censors discouraged stories of poorly built schools from being published in the media and there was an incident where police drove the protestors away.
As of July 17, 2008 what did parents complain of not receiving?
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Answer: any reports

Problem: Some Estonians, unwilling to side directly with the Nazis, joined the Finnish Army (which was allied with the Nazis) to fight against the Soviet Union. The Finnish Infantry Regiment 200 (Estonian: soomepoisid) was formed out of Estonian volunteers in Finland. Although many Estonians were recruited into the German armed forces (including Estonian Waffen-SS), the majority of them did so only in 1944 when the threat of a new invasion of Estonia by the Red Army had become imminent. In January 1944 Estonia was again facing the prospect of invasion from the Red Army and the last legitimate prime minister of the Republic of Estonia (according to the Constitution of the Republic of Estonia) delivered a radio address asking all able-bodied men born from 1904 through 1923 to report for military service. The call resulted in around 38,000 new enlistments and several thousand Estonians who had joined the Finnish Army came back to join the newly formed Territorial Defense Force, assigned to defend Estonia against the Soviet advance. It was hoped[by whom?] that by engaging in such a war Estonia would be able to attract Western support for Estonian independence.
Who composed the The Finnish Infantry Regiment 200?
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Answer:
Estonian volunteers in Finland