Mutations in a subset of humanity who develop supernatural gifts as an evolutionary trait. In my time it was still developing in a small percentage of people across the planet, but the number grows with each year.

[ Mutants are public knowledge in his world ever since the fight between him, Erik, Raven, and Hank was filmed and placed everywhere on television. Followed up by Erik's very dramatic stadium statement while attempting to assassinate the president. So their existence is not a secret anymore, something that Charles is still getting used to. It's his preference, he believes that the only way forward is by harmony, but only in a certain way.

Now he's not in that world so frankly, it might not matter in the least. He's touched enough vague minds of the people here to know the idea of supernatural entities is not that surprising. ]

I left the lab to create a school for those people and work together toward a safer world for us and everyone else. Although being here does put a damper on that idea.