When it comes to undesired noises, silencing guns is the same thing as silencing incessant yammerers. It all comes down to dealing with hot gas.
What is the texture of the universe? Turns out that it's kind of gooey. A group of physicists have used sound waves to analyze matter in the cosmos, and found that its consistency is exactly the same as chocolate syrup.
Go to this website, pick a material, send in an audio file. Get back jewelry in shape of the sound wave you gave them. It's simple, and oddly beautiful.
Imagine Lex Luthor as a really nice guy and you'll be pretty close to understanding Alfred Loomis. He was a scientist and inventor, a businessman and investor, a wealthy and prominent man. And he also invented the "Death Ray."
Got some free time and some candles? Try to extinguish a flame with your voice! We know it can be done, we're just not sure how it can be done. Maybe you'll have a breakthrough. Or maybe you'll just have a housefire.
As the only metal that is liquid at room temperature, mercury is freaky even under normal conditions. But check out what happens to a blob of the stuff when it's exposed to a different audio frequencies.