Recently, Google has pushed out two new system apps to many Android devices: Android System Safety Core and Android System Key Verifier. There has been a lot of outrage and misinformation about that, which has been blindly shared without bothering to check the truth or dig deeper. There is a great blog post by @SteffoSpieler and @finn@ice.finley.dev about that whole thing, which you should read: https://steffo.blog/outrage-warps-reality/

I just learned that there is an app to simulate train inverter sounds and it's very sophisticated

I love it omg

https://play.google.com/store/apps/details?id=com.qtsoundlab.ototetsu