Before I answer this question, I'd like to address some of the reactions I've gotten for this prompt. First, I used the name 'Mo' in the question, and if you go read Mo's chapter you will see that she has definitely confirmed that that is indeed her name - or at least one of them - so HAH! Second, it's merely a turn of phrase rather than actually referring to Mo and her knowledge - like 'that really gets my goat' or 'a skeleton in the closet'. If I was being literal, this challenge would actually be impossible because that girl knows everything.
Every piece of knowledge you give her, she and her google machine take five. It's like you can't even talk to her if you don't want to be woken up by the fire alarms on some fateful night.
That being said, something that Mo definitely doesn't know about me is that ... I have been at this spot for over half an hour god-dang it. Hmm okay - no jokes please, cause I'm tryna be serious - but kids are really cool. I don't know, like I don't think I've ever heard six-year-olds as a group be complemented during my entire life and I think that's sad. I'm the kind of guy who will run around the house fighting people with paper towel rolls even to this day, and kids are great because they don't hate me for that xD. Whenever I get to hang out with like my relative's kids or whatever I'm always up for their convoluted wizard/time travel shenanigans, and then people will come up and be like sorry my kid is annoying you and I'm like nah and they're like no really. Okay okay okay I know I'm just getting the good side of kids and like the second something bad happens woop back to your parents, but it's like they're not always a burden, okay and you don't have to be self-conscious about them all the time. They're not perfect but they're learning, and I think that's the coolest to see. I guess that was sorta about me in a way. This is six minutes late and dire.