Q: According to the theory of relativity, no information can travel faster than the speed of light in vacuum, but this does not mean that the refractive index cannot be lower than 1. The refractive index measures the phase velocity of light, which does not carry information. The phase velocity is the speed at which the crests of the wave move and can be faster than the speed of light in vacuum, and thereby give a refractive index below 1. This can occur close to resonance frequencies, for absorbing media, in plasmas, and for X-rays. In the X-ray regime the refractive indices are lower than but very close to 1 (exceptions close to some resonance frequencies). As an example, water has a refractive index of 6999999999740000000♠️0.99999974 = 1 6993260000000000000♠️2.610 for X-ray radiation at a photon energy of 6985480652946099999♠️30 keV (0.04 nm wavelength).
Can we conclude that is it possible to have a refractive index less than 1?
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A: yes
These terms are used with respect to reasoning (epistemology) to distinguish ''necessary conclusions from first premises'' (i.e., what must come before sense observation) from ''conclusions based on sense observation'' (which must follow it). Thus, the two kinds of knowledge, justification, or argument, may be glossed:
science begins with the premise that knowledge should first be acquired through observation?
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+++++
Answer: yes
Jack and his rebel band decide that the real symbol of power on the island is not the conch, but Piggy's glasses--the only means the boys have of starting a fire. They raid Ralph's camp, confiscate the glasses, and return to their abode on Castle Rock. Ralph, now deserted by most of his supporters, journeys to Castle Rock to confront Jack and secure the glasses. Taking the conch and accompanied only by Piggy, Sam, and Eric, Ralph finds the tribe and demands that they return the valuable object. Confirming their total rejection of Ralph's authority, the tribe capture and bind the twins under Jack's command. Ralph and Jack engage in a fight which neither wins before Piggy tries once more to address the tribe. Any sense of order or safety is permanently eroded when Roger, now sadistic, deliberately drops a boulder from his vantage point above, killing Piggy and shattering the conch. Ralph manages to escape, but Sam and Eric are tortured by Roger until they agree to join Jack's tribe.

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does piggy in lord of the flies die?

A: yes
Problem: Text: As of 2014 the building is owned by the Empire State Realty Trust with Anthony Malkin as Chairman, CEO, and President. Details on the trust's profits are scarce, but it is known that significantly more revenue was earned from tourism than from leasing the office space in 2011. In August 2016, the Qatar Investment Authority (QIA) obtained a 10% share in the Empire State Building through a $622 million investment in the Empire State Realty Trust. The trust's president John Kessler called it an ''endorsement of the company's irreplaceable assets''. The investment has been described by the real-estate magazine The Real Deal as ''an unusual move for a sovereign wealth fund'', as these funds typically buy direct stakes in buildings rather than real estate companies. Other foreign entities that have a stake in the Empire State Building include investors from Norway, Japan, and Australia.

Question: are there offices in the empire state building?

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A: yes
IN: Is it true that do you burn more calories than you eat celery?

Foods that are claimed to be negative in calories are mostly low-calorie fruits and vegetables such as celery, grapefruit, lemon, lime, apple, lettuce, broccoli, and cabbage. There is no scientific evidence to show that any of these foods have a negative calorific impact. Celery has a thermic effect of around 8%, much less than the 100% or more required for a food to have ''negative calories''. A stalk of celery provides 6 calories to the body, but the body expends only half of a calorie digesting it. Even proteins, which require the most energy to digest, have a thermic energy of only 20%--30%.

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OUT: no
Q: A solar eclipse (as seen from the planet Earth) is a type of eclipse that occurs when the Moon passes between the Sun and Earth, and when the Moon fully or partially blocks (''occults'') the Sun. This can happen only at new moon when the Sun and the Moon are in conjunction as seen from Earth in an alignment referred to as syzygy. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses, only part of the Sun is obscured.
Can we conclude that can there be a solar eclipse during a full moon?
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A:
no