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Under the doctrine of Erie Railroad Co. v. Tompkins (1938), there is no general federal common law. Although federal courts can create federal common law in the form of case law, such law must be linked one way or another to the interpretation of a particular federal constitutional provision, statute, or regulation (which in turn was enacted as part of the Constitution or after). Federal courts lack the plenary power possessed by state courts to simply make up law, which the latter are able to do in the absence of constitutional or statutory provisions replacing the common law. Only in a few narrow limited areas, like maritime law, has the Constitution expressly authorized the continuation of English common law at the federal level (meaning that in those areas federal courts can continue to make law as they see fit, subject to the limitations of stare decisis).

What states that there is no general federal common law?
Answer: the doctrine of Erie Railroad Co. v. Tompkins
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The target audience of natural history was French polite society, evidenced more by the specific discourse of the genre than by the generally high prices of its works. Naturalists catered to polite society's desire for erudition – many texts had an explicit instructive purpose. However, natural history was often a political affair. As E. C. Spary writes, the classifications used by naturalists "slipped between the natural world and the social ... to establish not only the expertise of the naturalists over the natural, but also the dominance of the natural over the social". The idea of taste (le goût) was a social indicator: to truly be able to categorize nature, one had to have the proper taste, an ability of discretion shared by all members of polite society. In this way natural history spread many of the scientific developments of the time, but also provided a new source of legitimacy for the dominant class. From this basis, naturalists could then develop their own social ideals based on their scientific works.

Was the target audience of natural history evidenced more by the price of publications or its specific discourse of the genre?
Answer: specific discourse of the genre
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Estonian language planners such as Ado Grenzstein (a journalist active in Estonia in the 1870s–90s) tried to use formation ex nihilo, Urschöpfung; i.e. they created new words out of nothing.

In what years did Ado Grenzstein do journalism work in Estonia?
Answer:
1870s–90s