In 1979, the Japanese state broadcaster NHK first developed consumer high-definition television with a 5:3 display aspect ratio. The system, known as Hi-Vision or MUSE after its Multiple sub-Nyquist sampling encoding for encoding the signal, required about twice the bandwidth of the existing NTSC system but provided about four times the resolution (1080i/1125 lines). Satellite test broadcasts started in 1989, with regular testing starting in 1991 and regular broadcasting of BS-9ch commencing on November 25, 1994, which featured commercial and NHK programming.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who first developed consumer HD television with a 1:3 aspect ratio?
Ah, so.. unanswerable

The word "Slavs" was used in the national anthem of the Slovak Republic (1939–1945), Yugoslavia (1943–1992) and the Federal Republic of Yugoslavia (1992–2003), later Serbia and Montenegro (2003–2006).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When was the word "Slavs" used in the national anthem of Yugoslavia?
Ah, so.. 1943–1992

Inscriptions have been found beneath many of the rock paintings, but archaeologists have so far been unable to decipher this form of ancient writing. During the Stone age, the Doian culture and the Hargeisan culture flourished here with their respective industries and factories.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Along with the Hargesian culture, what culture was present in Somalia in the Stone age?
Ah, so..
the Doian culture