Problem: In 1671, Robert Boyle discovered and described the reaction between iron filings and dilute acids, which results in the production of hydrogen gas. In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air". He speculated that "flammable air" was in fact identical to the hypothetical substance called "phlogiston" and further finding in 1781 that the gas produces water when burned. He is usually given credit for its discovery as an element. In 1783, Antoine Lavoisier gave the element the name hydrogen (from the Greek - hydro meaning "water" and - genes meaning "creator") when he and Laplace reproduced Cavendish's finding that water is produced when hydrogen is burned.
What year was the discovery of hydrogen gas?
The answer is the following: 1671

Problem: The parliamentary elections of 2005 aroused many accusations from opposition parties and international observers that President Emomalii Rahmon corruptly manipulates the election process and unemployment. The most recent elections, in February 2010, saw the ruling PDPT lose four seats in Parliament, yet still maintain a comfortable majority. The Organization for Security and Co-operation in Europe election observers said the 2010 polling "failed to meet many key OSCE commitments" and that "these elections failed on many basic democratic standards." The government insisted that only minor violations had occurred, which would not affect the will of the Tajik people.
What was the Tajikistan governments response?
The answer is the following: The government insisted that only minor violations had occurred, which would not affect the will of the Tajik people

Problem: The modern English word green comes from the Middle English and Anglo-Saxon word grene, from the same Germanic root as the words "grass" and "grow". It is the color of living grass and leaves and as a result is the color most associated with springtime, growth and nature. By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy. Many creatures have adapted to their green environments by taking on a green hue themselves as camouflage. Several minerals have a green color, including the emerald, which is colored green by its chromium content.
Other than "grass", what other Germanic root word is similar to green?
The answer is the following: grow

Problem: The evolution of Proto-Greek should be considered within the context of an early Paleo-Balkan sprachbund that makes it difficult to delineate exact boundaries between individual languages. The characteristically Greek representation of word-initial laryngeals by prothetic vowels is shared, for one, by the Armenian language, which also seems to share some other phonological and morphological peculiarities of Greek; this has led some linguists to propose a hypothetical closer relationship between Greek and Armenian, although evidence remains scant.
What progression coincided with the the early Greek states that makes it difficult to give credit for the language and differences ?
The answer is the following:
Paleo-Balkan sprachbund that makes it difficult to delineate exact boundaries between individual languages.