[Q]: In 1955, the Aurora Borealis, a coating applied to crystal stones to produce a "rainbow of colors" effect was introduced. Aurora Borealis crystals are pretty.
[A]: It's impossible to say

[Q]: Standing off to one side, seeing all and hearing Mozart's music, which only he understands to be a manifestation of God's love, is Antonio Salieri, the ambitious Italian-born composer and conductor, a favorite at the imperial court in Vienna in 1781. Austrian royalty favored Antonio Salieri
[A]: Yes

[Q]: Sir Edward Spragge (name also written as Spragg or Sprague) (circa 1620 – 21 August 1673) was an Irish admiral of the Royal Navy. He was a fiery, brilliantly accomplished seaman who fought in many great actions after the restoration of King Charles II in 1660. Sir Edward Spragge was a master ship builder
[A]: It's impossible to say

[Q]: PM has now firm projects which include a stake in a joint venture called Constellation in Samara involving the city's main tobacco factory. The city has only one tabacco factory
[A]: