Alright, Duo had a valid point. And that young lady he was rooming with did have hair that glowed. Way, way, way too much hair, but that glowing wasn't something typical.

"Any sufficiently advanced technology would be indistinguishable from magic, Duo. But I will admit I've seen at least one person here with glowing hair, and I can't think of any scientific reason to explain that short of building a Geiger counter. And by the time I could make one, any radiation damage would already be done to me."