Learn by doing. Math, computer science, and science.
Joined December 2012
- Tweets 1,956
- Following 172
- Followers 40,408
- Likes 5,677
261 Photos and videos
Pinned Tweet
May 29
Introducing Koji, a personal tutor for every home
AI is making kids dumber.
It should be making them geniuses.
Introducing Koji, the first AI tutor that gets kids to actually think. đ
20
9
127
19,723
The week that we launched our AI tutor Koji, âAIâ as a topic was getting commencement speakers booed off stage.
We were worried the launch was doomed, but instead it went super viral.
Why?
It turns out people arenât âanti-AIâ.
Theyâre anti-idiocracy, anti-job replacement, anti-slop.
But if you show them a product that will help them and their kids be better thinkers, theyâll embrace it.
A positive, pro-social vision of AI is hugely resonant.
Thanks @Jason @twistartups for having me on!
17
22
166
30,726
Jun 4
A great tutor is expressive!
Thanks to our friends @rive_app for making it possible to break Koji out of the chatbox, and infuse him with joyful dynamic range.
4
11
76
8,984
Jun 4
... and when the teaching's done, it's time to celebrate đ€©
1
1
11
738
'@tbpn: âDo you feel like you have a duty to make learning addictive?â
No. My goal is for our tutor Koji to work himself out of a job.
Koji offers more help when youâre doing conceptual learning, then steps back as you reach mastery.
A great tutor creates students who ask the questions that were once asked of them.
16
15
154
15,725
Brilliant.org retweeted
May 31
Our household is a huuuuuuge fan of the @brilliantorg app
Our 7yo is an avid DAU, deeply self-motivated to hit what Brilliant calls a âstreak of the centuryâ (smart naming)
True story: The day the AI tutor showed up for him in the app, he ran to tell me âmama! mama! Brilliant gave me my OWN personal tutor and I can ask it questions even while youâre on your phoneâ đ
Congrats @suekhim and team on this launch. Energizing the next generation to think and learn is an all-important mission, and as parents we all wish we had 1000x more hours in the day to teach our kids. Weâre so grateful youâre building to empower kids (and parents!) everywhere.
AI is making kids dumber.
It should be making them geniuses.
Introducing Koji, the first AI tutor that gets kids to actually think. đ
11
12
217
45,123
May 31
School conditioned generations of kids to ask: âWill this be on the test?â
The next generation will ask: âHow far can I go?â
May 31
Just spent an hour with daughter learning CS 101 from @brilliantorg
She doesnât want to give up until she beats Joyce B đ„
4
10
105
8,637
POV: Thinking is cool again
Insane response to the launch!
I tripled the # of gift invites and only have a few left, then wrapping the promo.
But, Koji is generally available today on Brilliantâs website/apps!
Thank you all so much for the support.
AI is making kids dumber.
It should be making them geniuses.
Introducing Koji, the first AI tutor that gets kids to actually think. đ
70
19
416
52,342
May 29
Private tutoring has been the most effective form of instruction for millennia, but it has been reserved for an elite few.
We built Koji for everyone else.
blog.brilliant.org/a-world-câŠ
3
6
44
5,702
May 29
Ultimately, the goal is for Koji to make himself unnecessary.
Koji offers more help when youâre doing conceptual learning, and steps back as you reach mastery.
His job is to gradually hand the thinking back to you, until you're the one asking yourself the questions he used to ask.
1
1
10
2,722
May 29
We spent a long time building a tutor we wished existed.
Nobody could prepare us for the magic of how it makes people feel.
Try Koji today: brilliant.org
2
12
1,953
When we create novel connections
We generate luck
Helping people find important work is one such stroke
Excited to see what you ship at Brilliant.org @OliviXu
2
47
19,415
Love this. Such an excellent description of what mathematical thinking is, and how it differs from ways you can computationally "do math".
4 Dec 2025
My daughter has very mathematical thinking, while her younger brother is naturally inclined toward computational thinking.
I once gave them a problem: Divide the numbers 1 to 9 into three groups such that the sum of each group is the same. How many ways are there to do this?
My daughter first reasoned about the upper bound on the number of possible partitions, then checked that the upper bound could be achieved, and concluded the answer is 2.
My son, on the other hand, listed out all possible partitions (with a bit of simple pruning), crossed out the invalid ones, and also arrived at the answer 2.
Every time I see someone report that LLMs with tools achieve higher solving rates for benchmarks like AIME, Iâm reminded of my sonâs way of solving problems. But my goal on reasoning research has always been to make LLMs solve problems the way my daughter does.
8
2
49
18,833
Real learning is hard. And it can feel âfun,â but not because of gamification.
From teaching math at Brilliant, weâve seen that classic gamification barely moves time-on-task.
The real gains come from the contentâs game design: clear goals ("Which quadrant is this in?"), varied situations and difficulty, the right degrees of freedom, and instant responsive feedback.
These create tight learning loops that drive understanding and a sense of progress, which are a lot more powerful than collecting points.
28 Nov 2025
there's an epidemic of fake learning. duolingo, tiktok, youtube. it's all entertainment cleverly disguised as education. real learning is hard. it's uncomfortable. if it feels 'fun', you probably aren't learning anything.
7
17
243
31,752
âWonât people just learn math on ChatGPT?â
Nope. Math learning lives in a different part of the brain than language processing.
28 Nov 2025
The Language Trap, as proven by MRI: people don't get math because they process math statements like standard linguistic expressions, while mathematicians recruit non-verbal regions of their brains.—ïž
5
8
84
10,295