Why does NASA have so much helium?

Could you elaborate on the question of why NASA possesses a significant amount of helium? Given the unique properties of helium, such as its low boiling point and inertness, I'm curious to know its specific applications within NASA's operations. Does it play a pivotal role in spaceflight, perhaps as a coolant in spacecrafts' cryogenic systems or in the pressurization of spacecraft cabins? Or does NASA's helium supply stem from its use in scientific experiments in space, like its potential use in particle accelerators? I'm intrigued to learn more about this intriguing aspect of NASA's operations.