Most types of capacitor include a dielectric spacer, which increases their capacitance. These dielectrics are most often insulators. However, low capacitance devices are available with a vacuum between their plates, which allows extremely high voltage operation and low losses. Variable capacitors with their plates open to the atmosphere were commonly used in radio tuning circuits. Later designs use polymer foil dielectric between the moving and stationary plates, with no significant air space between them.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What sort of dielectric is used in low capacitance devices?
Ah, so.. a vacuum

The oldest written records of the Finnic languages of Estonia date from the 13th century. Originates Livoniae in Chronicle of Henry of Livonia contains Estonian place names, words and fragments of sentences.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How far back do the first written records of Estonia's Finnic languages go?
Ah, so.. 13th century

Hospitals in Liberia include the John F. Kennedy Medical Center in Monrovia and several others. Life expectancy in Liberia is estimated to be 57.4 years in 2012. With a fertility rate of 5.9 births per woman, the maternal mortality rate stood at 990 per 100,000 births in 2010. A number of highly communicable diseases are widespread, including tuberculosis, diarrheal diseases and malaria. In 2007, the HIV infection rates stood at 2% of the population aged 1549 whereas the incidence of tuberculosis was 420 per 100,000 people in 2008. Approximately 58.2% 66% of women are estimated to have undergone female genital mutilation.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is the life expectancy in Monrovia?
Ah, so..
unanswerable