Refraction (sound) Refraction (sound) Refraction, in acoustics, comparable to the refraction of electromagnetic radiation, is the bending of sound propagation trajectories (rays) in inhomogeneous elastic media (gases, liquids, and solids) in which the wave velocity is a function of spatial coordinates. Bending of acoustic rays in layered inhomogeneous media occurs towards a layer with a smaller sound velocity. This effect is responsible for guided propagation of sound waves over long distances in the ocean and in the atmosphere. In the atmosphere, vertical gradients of wind speed and temperature lead to refraction. The wind speed is usually increasing with height, which leads to
Not a Damn Thing Changed tribute to one of the guys I grew up with who hung himself in January. He was three months older than me and we walked through life together." A music video to accompany the release of "Not a Damn Thing Changed" was first released on YouTube on 11 October 2018 at a total length of three minutes and forty-nine seconds. The video was directed by René Sascha Johannsen. Forchhammer's real-life childhood friends appear in the video, which they filmed in Copenhagen and their hometown, Christiania. Not a Damn Thing Changed "Not a Damn Thing Changed" is a song by Danish