Go into a science or engineering laboratory. Close your eyes. And listen. Welcome to our third Sounds of Innovation episode, an intermittent feature of our Voices from DARPA podcast. Rather than hearing the voices of program managers, which is normally what you get in a Voices from DARPA podcast, in each Sounds of Innovation episode, you hear some of the soundscapes of research and development, and you learn just a little bit about the world-changing capabilities those sounds could lead to. See if you can guess how the sounds were produced before our podcast host reveals their origin. One hint for the first set of soundscapes is that they have nothing to do with big drops of rain hitting a tin roof. Here’s a lead regarding the second soundscape: you might want to be sitting when the host reveals the extreme-tech that produced the sound. For the third set of sounds, let’s just say that if you were a mosquito – and we are not saying you are – the sounds definitely would not be music to your ears.