Question: Extract the answer to the question from the following context. Question: what proto In word means forest Context: Although the etymology of the name has been studied since the 7th century by authors like Isidore of Seville who wrote that "Galicians are called so, because of their fair skin, as the Gauls", relating the name to the Greek word for milk, currently scholars derive the name of the ancient Callaeci either from Proto-Indo-European *kal-n-eH2 'hill', through a local relational suffix -aik-, so meaning 'the hill (people)'; or either from Proto-Celtic *kalli- 'forest', so meaning 'the forest (people)'. In any case, Galicia, being per se a derivation of the ethnic name Kallaikoi, would mean 'the land of the Galicians'.
Answer: kalli

Question: Extract the answer to the question from the following context. Question: What is different about reversible time in quantum mechanics? Context: A third type of solution to the problem of the direction of time, although much less represented, argues that the laws are not time-reversal symmetric. For example, certain processes in quantum mechanics, relating to the weak nuclear force, are not time-reversible, keeping in mind that when dealing with quantum mechanics time-reversibility comprises a more complex definition. But this type of solution is insufficient because 1) the time-asymmetric phenomena in quantum mechanics are too few to account for the uniformity of macroscopic time-asymmetry and 2) it relies on the assumption that quantum mechanics is the final or correct description of physical processes.[citation needed]
Answer: comprises a more complex definition

Question: Extract the answer to the question from the following context. Question: What can be compared to Compass? Context: Compass-M1 is an experimental satellite launched for signal testing and validation and for the frequency filing on 14 April 2007. The role of Compass-M1 for Compass is similar to the role of the GIOVE satellites for the Galileo system. The orbit of Compass-M1 is nearly circular, has an altitude of 21,150 km and an inclination of 55.5 degrees.
Answer:
Galileo system