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Olbers's paradox, also known as the dark night paradox or Olbers and Cheseaux's paradox, is an argument in astrophysics and physical cosmology that says the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe.
Science is a systematic discipline that builds and organises knowledge in the form of testable hypotheses and predictions about the universe. [1] [2] Modern science is typically divided into two or three major branches: [3] the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; and the social sciences (e.g., economics, psychology, and sociology), which ...
Logic (from Greek: λογική, logikḗ, 'possessed of reason, intellectual, dialectical, argumentative') [5] [6] [note 1] is the systematic study of valid rules of inference, i.e. the relations that lead to the acceptance of one proposition (the conclusion) on the basis of a set of other propositions .
A similar study was conducted among men who overwintered at Belgrano II, an Argentine research station in Antarctica. The station is located at 77 degrees south, resulting in a polar night 4 months in length. The study was conducted across 5 different winter campaigns in the 2010s, bringing in a total of 82 participants.
In vertebrates, the master circadian clock is contained within the suprachiasmatic nucleus (SCN), a bilateral nerve cluster of about 20,000 neurons. [10] [11] The SCN itself is located in the hypothalamus, a small region of the brain situated directly above the optic chiasm, where it receives input from specialized photosensitive ganglion cells in the retina via the retinohypothalamic tract.
The poem opens [4] in a way that suggests reflection—the speaker remembers (and, is so, older now) the night his mother was stung by a scorpion, which bit the mother because of its predatory impulse, while hiding beneath a bag of rice to escape from the rain. The speaker specifically remembers this night due to this event namely, the mother ...
DIF refers to the difference between daytime and nighttime temperatures. DIF is calculated by subtracting the nighttime temperature from the daytime temperature to get a +DIF when the daytime is warmer, or a -DIF when the night time is warmer. When there is a +DIF, elongation rates are normal, but when there is a -DIF elongation rates are lowered.
Traditionally, Ma Nishtana is recited in the chant form called the major lern-steiger ("study mode" – a chant used for reciting lessons from the Talmud or Mishnah). [6] One of the current tunes widely used for the Ma Nishtana was written by Ephraim Abileah in 1936 as part of his oratorio "Chag Ha-Cherut".