In the latter half of the 19th century the locale of South Kensington was developed as "Albertopolis", a cultural and scientific quarter. Three major national museums are there: the Victoria and Albert Museum (for the applied arts), the Natural History Museum and the Science Museum. The National Portrait Gallery was founded in 1856 to house depictions of figures from British history; its holdings now comprise the world's most extensive collection of portraits. The national gallery of British art is at Tate Britain, originally established as an annexe of the National Gallery in 1897. The Tate Gallery, as it was formerly known, also became a major centre for modern art; in 2000 this collection moved to Tate Modern, a new gallery housed in the former Bankside Power Station.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What was the original purpose for the construction of the Tate Gallery?
Ah, so.. as an annexe of the National Gallery

A P-N junction can convert absorbed light energy into a proportional electric current. The same process is reversed here (i.e. the P-N junction emits light when electrical energy is applied to it). This phenomenon is generally called electroluminescence, which can be defined as the emission of light from a semi-conductor under the influence of an electric field. The charge carriers recombine in a forward-biased P-N junction as the electrons cross from the N-region and recombine with the holes existing in the P-region. Free electrons are in the conduction band of energy levels, while holes are in the valence energy band. Thus the energy level of the holes will be lesser than the energy levels of the electrons. Some portion of the energy must be dissipated in order to recombine the electrons and the holes. This energy is emitted in the form of heat and light.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Whose energy levels are lower than the electrons in the electroluminescence process?
Ah, so.. holes existing in the P-region

The 1960s was a significant decade for Iranian cinema, with 25 commercial films produced annually on average throughout the early 60s, increasing to 65 by the end of the decade. The majority of production focused on melodrama and thrillers. With the screening of the films Kaiser and The Cow, directed by Masoud Kimiai and Dariush Mehrjui respectively in 1969, alternative films established their status in the film industry. Attempts to organize a film festival that had begun in 1954 within the framework of the Golrizan Festival, bore fruits in the form of the Sepas Festival in 1969. The endeavors also resulted in the formation of the Tehran World Festival in 1973.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What Iranian film festival in 1954 was the progenitor of future film festivals in 1969 and 1973?
Ah, so..
the Golrizan Festival