Question: "Do n't Turn Around" is a popular song written by Albert Hammond and Diane Warren. It was originally recorded by Tina Turner as the B-side to the single "Typical Male" in 1986. Warren is said to have been disappointed that Turner's record company treated the song as a B-side and never included it on one of her albums. However it has since been included on the rarities disc of the 1994 compilation The Collected Recordings -- Sixties to Nineties.

Based on this passage, who sings the song don't turn around?
Answer: To answer this question, we should know that: It was originally recorded by Tina Turner as the B-side to the single "Typical Male" in 1986. The answer is Tina Turner.

Question: The video of the song is in black-and-white. It was made to visualize what Shakur narrates. The first part shows Shakur and "Brenda" and then the actual story starts. Ethel "Edy" Proctor is the leading lady in the video.

Answer this question: who is the girl in brenda's got a baby?
Answer: To answer the above question, the relevant sentence is: Ethel "Edy" Proctor is the leading lady in the video. The answer is Ethel `` Edy '' Proctor.

Question: Passage: Flash-gas may be detected in the system by the observation of bubbles or gas presence in the liquid line, or the foamy aspect of the fluid. Depending on the location of the glass: this may also indicate an overwhelmed condenser, and the nonobservance of these at the glass is n't definite of the nonoccurrence of flash-gas in the liquid line.

Question: Based on this passage, how can flash gas in the liquid line be identified?
Answer: The relevant information is: Flash-gas may be detected in the system by the observation of bubbles or gas presence in the liquid line, or the foamy aspect of the fluid. The answer is by the observation of bubbles or gas presence in the liquid line , or the foamy aspect of the fluid.

Question: Electromagnetic radiation can be transmitted through an optical medium, such as optical fiber, or through twisted pair wires, coaxial cable, or dielectric-slab waveguides. It may also pass through any physical material that is transparent to the specific wavelength, such as water, air, glass, or concrete. Sound is, by definition, the vibration of matter, so it requires a physical medium for transmission, as do other kinds of mechanical waves and heat energy. Historically, science incorporated various aether theories to explain the transmission medium. However, it is now known that electromagnetic waves do not require a physical transmission medium, and so can travel through the "vacuum" of free space. Regions of the insulative vacuum can become conductive for electrical conduction through the presence of free electrons, holes, or ions.

Answer this question based on the passage: which type of wave requires a medium for transmission?
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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To answer the above question, the relevant sentence is: Sound is, by definition, the vibration of matter, so it requires a physical medium for transmission, as do other kinds of mechanical waves and heat energy. The answer is Sound.