Gliese 12 b is an Earth-size planet orbiting in the temperate zone around a nearby, stable red dwarf star. It's a Rosetta Stone world that will tell us a lot about how many superficially earthlike planets actually have the right conditions for life.
If you're the kind of person who likes to go deep, I got you.
The full research paper is freely available online, providing the technical details of how astronomers found the Earth-size planet Gliese 12b, and what we really do (and do not) know about it.