Back in the days of 35mm film, a 50mm prime was considered a 'standard' lens. That's because it gives pretty much the same perspective as viewing a scene with the human eye, without the magnification of a telephoto lens or the shrinkage a wide-angle lens uses to squeeze more into the frame.
The flexi disc (also known as a phonosheet or Soundsheet, a trademark) is a phonograph record made of a thin, flexible vinyl sheet with a molded-in spiral stylus groove, and is designed to be playable on a normal phonograph turntable.
The type of pain caused by a bulging disc is a clue to where the abnormal disc is located: lumbar bulging discs most often cause pain in the buttocks, legs, feet and abdomen; cervical bulging discs most often cause pain in the head, neck, shoulders, arms, elbows, wrists, hands and fingers; thoracic bulging discs cause pain in the hands, chest, back and abdomen.