In this sonification of Perseus. the sound waves astronomers previously identified were extracted and made audible for the first time. The sound waves were extracted outward from the center. (source)
me as a child: this "$4.99" sales stuff is idiotic, anyone can instantly round this up to $5 in their mind, no one is falling for this
me as an adult: oh wow only $4 (with some additional numbers behind it), that's great because if it was a single dollar more that would have been the last straw for me in my miserable life