QUES: One-color light is well suited for traffic lights and signals, exit signs, emergency vehicle lighting, ships' navigation lights or lanterns (chromacity and luminance standards being set under the Convention on the International Regulations for Preventing Collisions at Sea 1972, Annex I and the CIE) and LED-based Christmas lights. In cold climates, LED traffic lights may remain snow-covered. Red or yellow LEDs are used in indicator and alphanumeric displays in environments where night vision must be retained: aircraft cockpits, submarine and ship bridges, astronomy observatories, and in the field, e.g. night time animal watching and military field use.

What color LEDs are used when night vision is important?
What is the answer?
ANS: Red or yellow
QUES: ^1 Also considered part of Rusyns
^2 Considered transitional between Ukrainians and Belarusians
^3 The ethnic affiliation of the Lemkos has become an ideological conflict. It has been alleged that among the Lemkos the idea of "Carpatho-Ruthenian" nation is supported only by Lemkos residing in Transcarpathia and abroad
^4 Most inhabitants of historic Moravia considered themselves as Czechs but significant amount declared their Moravian nationality, different from that Czech (although people from Bohemia and Moravia use the same official language).
^5 Also considered Poles.
^6 There are sources that show Silesians as part of the Poles. Parts of the southmost population of Upper Silesia is sometimes considered Czech (controversial).

Ethnic affiliation of who has become an ideological conflict?
What is the answer?
ANS: the Lemkos
QUES: Television transmissions resumed from Alexandra Palace in 1946. The BBC Television Service (renamed "BBC tv" in 1960) showed popular programming, including drama, comedies, documentaries, game shows, and soap operas, covering a wide range of genres and regularly competed with ITV to become the channel with the highest ratings for that week. The channel also introduced the science fiction show Doctor Who on 23 November 1963 - at 17:16 - which went on to become one of Britain's most iconic and beloved television programmes.

What did the BBC do with the network, IVT?
What is the answer?
ANS:
unanswerable