"But it's an idea, anyway, as I get more acquainted with the library stock I should consider issuing book recommendations."

"Are you finding it a pleasant partnership with Blueberry?"

"She's very helpful! Which is good, because being a librarian would really be a full time job for one pony, and I have other things to do, but with her helping I can pick up what's left in my spare time. If the mayor gets back to me and says I have a budget I'm going to pay her."

"She is a very capable pony. The library is in good hooves."

"Extremely precocious. I was precocious too, but not that much."

"She is very unusual, yes. I'm sometimes surprised that she does not yet have her cutie mark."

"I heard Cordy's story about hers and the squirrels, yesterday. How'd you get yours?"

"At the same time as my sister. She was testing her first set of flight boots and accidentally created a sonic rainboom. I observed the direction and distance and immediately realized she must have done it, even though I hadn't known she was working on anything at the time."

"...That's funny, I saw a sonic rainboom out the window right before I got mine."

"And a sonic rainboom is what scared Cordy's squirrels. Interesting coincidence, isn't it?"

"Rather. Maybe lots of ponies were sort of - prompted by it. It was sort of relevantly inspiring; I was trying to do the magical equivalent of brute forcing my final exam and then it sort of reminded me that magic can just interact physically with the world."

She smiles. "It's possible that it prompted a lot of ponies. But I think I'd want to know why, if that turned out to be true."

"Yeah, it's not a known feature of rainbooms, or if it is, it's not documented well enough for me to have found it when I looked them up after the event."

"So, effectively, not known to you. Hmm. I can't readily think of any explanations," she says. "That doesn't happen often."

"Rainbooms don't, or you not thinking of explanations doesn't?"

"I suppose that, technically speaking, sonic rainbooms are rarer than me not being able to think of an explanation for something."

Clarity giggles. "But that isn't what you meant, is it."

"It isn't!" she agrees.

"Wouldn't it be funny if Guiding got hers the same way? I guess Joy would be left out anyway, though."

"Naturally, yes."

"Want to go to Guiding's house and ask her?"

"I think that would be interesting."

Clarity has figured out where they are at this point, and does know the way to Guiding Star's house. There she trots.

"Hello," says Streak. "I've just been given cause to wonder how you got your cutie mark."