He pauses, and then draws 

"Yeah, exactly! --The easier way to draw it is called a graph, but it's a weird math meaning of graph. You make each of the bags be a dot, which we call the node, and then you draw a line connecting them if one of them is inside the other one."

He draws:

"So like this?" 

"Oh, that's really good! You didn't make a mistake lots of people make when they first learn about graphs, where they treat--"

"--as different graphs. I'm really skeptical about you being bad at math."

"It's the same kind of problem as pentominoes, I used to mess around with those in middle school. — how many did I miss, I definitely missed some, I can see two that I missed right now." 

"You missed four! --You see why I didn't get any work done today."

"I can!

— I've been called a lot of things but I don't think 'good at math' has ever been one of them, thank you." 

"You have a good mathematical intuition! --Oh, man, if you are good at math and you think you're bad at math, then there are so many math things I can show you."

He literally bounces. 

That's adorable. 

"You can!" 

"I never get to teach anybody anything anymore, it sucks. I used to tutor in high school and the beginning of college and then, uh, I accidentally did a startup instead."

"Well, apparently you can explain math to me." He pauses, then takes the bait. "What's the startup do?" 

He's very quiet. 

...okay, if the startup tortures puppies or something that's going to be a problem. "Obviously you don't have to tell me if you don't want." 

"...I cofounded Yenta."

He blinks. 

"Cool. I'd ask how the algorithm works but there is approximately a zero percent chance I will understand the answer." 

"Also I'd have to make you sign a non-disclosure agreement which is a bit hard since I don't actually know, like, your name."

"That too!" 

"I like how obviously I am the founder who made the algorithm and not the founder who had meetings with angel investors to tell them to give us money."

"You just generally seem like more of a computer person than a meetings person, it's the getting nerdsniped by interesting math problems." 

"I'm really more of a psych person! Yenta was an independent study project that got way, way out of hand."

"Way out of hand," he agrees. 

"Claire-- my cofounder-- was like 'I'll give you money to keep working on this' and I was like 'sure' because I kind of always needed money and then at some point junior year she was nagging me to finish a feature and I was like 'I have to study for midterms' and she was like 'you're a multimillionaire' and I was like 'what.'"

"Incredible. Best 'how I made my fortune' story." 

"I was like 'maybe... I should stop eating ramen and get clothes that don't have holes in them...?'"

"And did you in fact do that?"