Motors have very little room for electrical insulation so they generally have low voltage ratings. Because transformers (prior to the development of power electronics) cannot step down DC voltages, trains were supplied with a relatively low DC voltage that the motors can use directly. The most common DC voltages are listed in the previous section. Third (and fourth) rail systems almost always use voltages below 1 kV for safety reasons while overhead wires usually use higher voltages for efficiency. ("Low" voltage is relative; even 600 V can be instantly lethal when touched.)
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many volts can be considered nonlethal when touched?
Ah, so.. unanswerable

According to heraldic sources total number of legal ennoblements issued between the 14th century and the mid-18th century, is estimated at approximately 800. This is an average of only about two ennoblements per year or only 0.000 000 14 – 0.000 001 of historical population. Compare: historical demography of Poland.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Around what time was the total legal number of ennoblement at 800?
Ah, so.. between the 14th century and the mid-18th century,

Historically home to the Kumeyaay people, San Diego was the first site visited by Europeans on what is now the West Coast of the United States. Upon landing in San Diego Bay in 1542, Juan Rodríguez Cabrillo claimed the entire area for Spain, forming the basis for the settlement of Alta California 200 years later. The Presidio and Mission San Diego de Alcalá, founded in 1769, formed the first European settlement in what is now California. In 1821, San Diego became part of the newly-independent Mexico, which reformed as the First Mexican Republic two years later. In 1850, it became part of the United States following the Mexican–American War and the admission of California to the union.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What native people lived in the San Diego area before the Mexicans arrived?
Ah, so..
unanswerable