system
Given the following post, respond as if you're commenting on Reddit:
human
Getting post-graduate degrees in biology at no cost?

My 17-year-old daughter loves biology, especially genetics, and ultimately wants to get her doctorate and do research. We've been visiting potential universities and were excited to hear that in STEM fields, once you have your undergrad degree, you can do grad school at no cost to you, through filling assistant teaching positions that pay you by waiving your tuition and giving you a stipend to cover room and board. We have very limited means, so were over the moon to hear this, but it almost seems too awesome to be true so I thought I'd look for further verification on this.
gpt
It's true; any PhD program worth its salt will provide a stipend while you work as a research or teaching assistant. Some people also earn internal or external fellowships that cover expenses, though they are pretty competitive.