Math in Action 2025

I have the privilege of sharing a wide range of ways that I use Desmos, especially the Desmos activity builder, at the Math in Action conference on Grand Valley State University’s campus! Whether a teacher is brand new or has been in the classroom to decades, my hope is that all participants can find something valuable and usable in their classroom! Here are my “slides,” which is built in the Desmos Activity Builder.

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Everyone is probably already aware of this, but it was only a matter of time before advertising came to AI chatbots. Perplexity seems aware of the problems with this, and is going to try to mitigate it. We’ll see. I suspect the game theory will drive a race to the bottom similar to social media.

Although, powerful open source models may be disruptive enough that advertising in AI LLMs doesn’t have the influence like it does in social media. Imagine if nostr and twitter started at the same time and nostr didn’t have to fight the network effect of most people having their social graph in FB, twitter, IG, etc.

To fully deliver on our mission to spark the world’s curiosity, we need to invest in building not just a beloved product, but a robust and self-sustaining business. That’s why starting this week, we will begin experimenting with ads on Perplexity.

Before getting into the details, we want to highlight our guiding principle: the content of the answers you receive on Perplexity will not be influenced by advertisers. Users come to Perplexity for a more efficient, uncluttered, and unbiased search experience, and that isn’t changing.

Ads will appear in the US to start and will be formatted as sponsored follow-up questions and paid media positioned to the side of an answer. Here’s an example of how they will appear:

Why we’re experimenting with advertising

Good stuff.

Prioritize:

A simpler way to think about teens and phones

From the book “math without numbers” by Milo Beckman

Interesting take on AI hype from Freddie deBoer.

Some say AI is the greatest invention of all time. I don’t get it.

Anyone who cites AI as the pinnacle of human ingenuity, above plumbing, should try spending a month without the latter.

I exercised for 300 days in a row - and then I crushed my ankle

Around spring break of last year (2024) I decided to exercise every day. I worked out fairly consistently, 3-4 days a week, for close to two years at that point, but I decided to commit to every day for a few reasons. First, I learned that natural muscle loss from aging can start in your mid thirties. Despite my insistence that the final season of The Office ended just a few years ago (it was 2013), by most chronological accounting methods I’m 35 years old.

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Quote from Seneca that resonated with me.

“I say, let no one rob me of a single day who isn’t going to make a full return on the loss.” —SENECA

It’s not just red dye no. 3. It’s all our stuff.

RFK Jr. has the potential to do what Sinclair did in the early twentieth century: to shift the vibe, and spark the public into demanding companies remake their products for the twenty-first century. America cannot claim to be exceptional while making inferior, toxic products. The process will take decades to fully mature, but Americans have never been afraid to insist on better. It’s time that we do that now, and demand a Great Reformation.

Hopefully TikTok will be banned as scheduled.

And even if parental controls worked and parents chose to shield their kids from bad stuff, they can’t because TikTok’s content moderation is poor. An internal study found that the “leakage rate” (of bad stuff getting past moderators) is as follows: 35.71% of “Normalization of Pedophilia” content; 33.33% of “Minor Sexual Solicitation” content; 39.13% of “Minor Physical Abuse” content; 30.36% of “leading minors off platform”; 50% of “Glorification of Minor Sexual Assault”; and 100% of “Fetishizing Minors.” For those who think that social media is relatively harmless, we urge you to read the quotations and internal studies described below, in which employees of TikTok discuss the vast and varied harms that they are causing to literally millions of American children each year.

open.substack.com/pub/jonat…

Easily use AI to convert handwritten notes to text

It dawned on me today as I was taking notes on a video about weekly reviews that I could probably upload a picture of my notes to Claude and ask it to transcribe them into text. And, even with my poor handwriting, it did a great job. I also asked it to format it as a bulleted list with sub bullets, which it did. If my handwriting was slightly better it would’ve done an even better job.

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Creating a Critical Thinking Curriculum

A couple of years ago I was on Drew Perkins’s podcast to discuss a curriculum that Will Reusch and I designed called Critical Thinking Across the Disciplines. I realized that I never actually posted about it on my blog, so here it is. Here’s the podcast description: Drew Perkins talks with Will Reusch and Zach Cresswell about the Critical Thinking Across the Disciplines curriculum they’ve created and are piloting with funding through Heterodox Academy.

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Testing youtube shortcode. Here is the video from my previous post.

I thought that large language models might asymptote in their capabilities. If that’s true then it doesn’t seem like we’ve reached that limit yet.

youtu.be/NFgFQO282…

AGI or not, we can't close our eyes

There’s been a conversation about when AGI will arrive for a long time. That time horizon has shrunk since chatGPT came on the scene, obviously. However, for a while I thought maybe these models would asymptote. I’m not convinced of that anymore. I think AGI, or something close enough, is hurdling towards us. We need to start grappling with these questions (and by “we” I mean the general public, as I’m sure many in the industry have these conversations frequently):

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An incredibly snowy and peaceful Christmas Eve.

Excellent little coffee shop. Worked on migrating my old blog posts to micro.blog and tweaking some settings. Hoping to make a new space on the internet for my thoughts as Twitter is a hellscape and Nostr isn’t quite ready for prime time yet. ☕️

Check it out: z-cress.micro.blog

The pace of change in AI tools is spectacular and it’s incredibly difficult for educators to understand the tools, determine how to integrate them, consider policies around them, consider long term impacts on learning, figure out if or when the service will cost money, etc. And about the time that’s figured out there’s a new set of tools or updates or something new to think about.

It’s simultaneously an exciting time to be an educator and a difficult time to be an educator.

Interacting with AI Podcasters in Real Time

AI continues to amaze me. I recorded this video this morning and had to share because it is so mind blowing. Educator friends, this is where we’re at. I don’t even know if this is the leading edge of what’s available, but I have to think that in terms of free tools, this is pretty close. NotebookLM can generate podcasts based on various materials. I uploaded a PDF of an excerpt from John Stuart Mill’s “On Liberty” and generated a podcast.

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(Finally) Getting Better at Teaching Optimization

In calculus I teach a concept called “optimization,” which, as I tell students, is an application of pretty much everything they’ve ever learned in math class. Not only that, all the problems are “story problems.” It can be a very tough section for students. The irony is that the calculus is not the difficult part. It’s interpreting the situation, sketching it correctly, developing the correct model, integrating constraints into the model, and finally interpreting what the model is telling you.

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Even if I was a therapist, I wouldn’t use social-emotional circles

Part three of a three-part series called “Breaking my silence on social-emotional learning.” You can read part one here and part two here.  Photo by Tima Miroshnichenko Until this point I’ve argued that since I’ve trained most of my adult life to teach math, and not give therapy, I shouldn’t try to become a therapy hobbyist with the teenagers in my classroom. I’ve also argued that the thorny issue of confidentiality probably can’t be overcome with any clear benefit to students.

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