The Fast Fourier Transform is used everywhere but it has a fascinating origin story that could have ended the nuclear arms race.
Someone discovered this important technique 150(ish?) years before it was published — but the only place the scientist included it was in their “collected works vol 3,” in Latin, so basically no one knew about it.
You never know when the “quick trick” you’ve figured out could help someone else have a breakthrough 🤷♀️