Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Naturally occurring glass, especially the volcanic glass obsidian, has been used by many Stone Age societies across the globe for the production of sharp cutting tools and, due to its limited source areas, was extensively traded. But in general, archaeological evidence suggests that the first true glass was made in coastal north Syria, Mesopotamia or ancient Egypt. The earliest known glass objects, of the mid third millennium BCE, were beads, perhaps initially created as accidental by-products of metal-working (slags) or during the production of faience, a pre-glass vitreous material made by a process similar to glazing.
What was obsidian used to make in prehistoric times?
A: cutting tools

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Various methods have been used in the history of the American colonies and the United States but only five methods are currently used. Historically, burning, crushing, breaking on wheel, and bludgeoning were used for a small number of executions, while hanging was the most common method. The last person burned at the stake was a black slave in South Carolina in August 1825. The last person to be hanged in chains was a murderer named John Marshall in West Virginia on April 4, 1913. Although beheading was a legal method in Utah from 1851 to 1888, it was never used.
What was the least common historical method of execution in the United States?
A: unanswerable

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Napoleon was born on 15 August 1769, to Carlo Maria di Buonaparte and Maria Letizia Ramolino, in his family's ancestral home Casa Buonaparte in Ajaccio, the capital of the island of Corsica. He was their fourth child and third son. This was a year after the island was transferred to France by the Republic of Genoa. He was christened Napoleone di Buonaparte, probably named after an uncle (an older brother who did not survive infancy was the first of the sons to be called Napoleone). In his 20s, he adopted the more French-sounding Napoleon Bonaparte.[note 2]
Napoleon was most likely named after what family relation?
A: an uncle

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Finally, an introduced species may unintentionally injure a species that depends on the species it replaces. In Belgium, Prunus spinosa from Eastern Europe leafs much sooner than its West European counterparts, disrupting the feeding habits of the Thecla betulae butterfly (which feeds on the leaves). Introducing new species often leaves endemic and other local species unable to compete with the exotic species and unable to survive. The exotic organisms may be predators, parasites, or may simply outcompete indigenous species for nutrients, water and light.
What does introducing new spinosas often do?
A:
unanswerable