Fashion: The first widely used synthetic fiber.?

Questions

[Tv, Music and entertainment] which band had an album in 1975 called 'a night at the opera'?

[Tv, Music and entertainment] what was the name of the character played by antino fargas in 'starsky and hutch'?

who was the first roman catholic president of the United States?

what does Glasnost mean?

what type of weather is expected during the 'dog days'?