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The beginning of the 20th century brought the start of a revolution in physics. The long-held theories of Newton were shown not to be correct in all circumstances. Beginning in 1900, Max Planck, Albert Einstein, Niels Bohr and others developed quantum theories to explain various anomalous experimental results, by introducing discrete energy levels. Not only did quantum mechanics show that the laws of motion did not hold on small scales, but even more disturbingly, the theory of general relativity, proposed by Einstein in 1915, showed that the fixed background of spacetime, on which both Newtonian mechanics and special relativity depended, could not exist. In 1925, Werner Heisenberg and Erwin Schrodinger formulated quantum mechanics, which explained the preceding quantum theories. The observation by Edwin Hubble in 1929 that the speed at which galaxies recede positively correlates with their distance, led to the understanding that the universe is expanding, and the formulation of the Big Bang theory by Georges Lemaitre.

Edwin Hubble's discovery about galaxies allowed for which theory by Georges Lemaitre?
Answer: the Big Bang theory
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In Theravada Buddhism, the ultimate goal is the attainment of the sublime state of Nirvana, achieved by practicing the Noble Eightfold Path (also known as the Middle Way), thus escaping what is seen as a cycle of suffering and rebirth. Mahayana Buddhism instead aspires to Buddhahood via the bodhisattva path, a state wherein one remains in this cycle to help other beings reach awakening. Tibetan Buddhism aspires to Buddhahood or rainbow body.

How is Nirvana attained?
Answer: by practicing the Noble Eightfold Path
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Cork has been culturally diverse for many years, from Huguenot communities in the 17th century, through to Eastern European communities and a smaller numbers from African and Asian nations in the 20th and 21st centuries. This is reflected in the multi-cultural restaurants and shops, including specialist shops for East-European or Middle-Eastern food, Chinese and Thai restaurants, French patisseries, Indian buffets, and Middle Eastern kebab houses. Cork saw some Jewish immigration from Lithuania and Russia in the late 19th century. Jewish citizens such as Gerald Goldberg (several times Lord Mayor), David Marcus (novelist) and Louis Marcus (documentary maker) played notable roles in 20th century Cork. Today, the Jewish community is relatively small in population, although the city still has a Jewish quarter and synagogue. Cork also features various Christian churches, as well as a mosque. Some Catholic masses around the city are said in Polish, Filipino, Lithuanian, Romanian and other languages, in addition to the traditional Latin and local Irish and English language services.

When did Cork begin to see people from Russia and Lithuania immigrating to their city?
Answer:
late 19th century