I tracked every word that Ruby learned to say in the first 2.5 years of life, analyzing vocab compared to her brothers.

In which I ignore how many copies of The Motivation Hacker I sold for six years, then "just" ask the AI.

In which I have a magical Christmas shopping experience with the AI

Photos from the first few weeks of baby Ruby's life

I tracked every word that Clark learned to say in the first 2.5 years of life, graphing it and comparing it to Max's.

I was talking to a friend who seemed to be independently rediscovering what he called self-referential motivation: m...

Here's another concept from language learning pedagogy (see also Extensive vs. Intensive Learning): the difference b...

In language learning, there's a slightly obscure but useful concept of "extensive reading" vs. "intensive reading". ...

I use a site called PredictionBook to make predictions, say how likely I think they are to occur, and then later jud...

Humans are naturally bad at predictions. Being bad at predictions, and figuring out how to make better ones, sounds ...

Now I have two kids. So far, it's pretty similar to just having one kid. The time and energy needed to sustain doubl...

I always love it when people share revenue data for their apps / games / books / works, and it's been four years sin...

Max's vocabulary started exploding around 15-17 months old. I started writing down everything he could say (with und...