Nice work. I like the simple, unobtrusive and ad-free interface. I have kids who could use this although you face lots of competition for their very limited allotted active screen time [1]. The 6 yo gets 45 mins a week on the computer, usually opting for PBSkids, Kodable or Scratch. The 3 yo gets 15 mins usually opting for guided digital canvas painting as she learns to use a mouse.

There are a few good no-screen puzzle books for kids (lookup the ones by Usborne).

As a recent publisher of an interactive children's book [2], I am seeing more sales of the physical books than the digital/web editions despite the latter having more features including an element of teaching math.

Curious if you considered publishing a physical book with these concepts/math puzzles?

[1] This app inspires me to upgrade some of their passive screen time (TV) to more of your and similar apps

[2] https://tendollaradventure.com

So with any conventional transistor including the GaN HEMT, the input/gate capacitance must be charged in order for the transistor to turn on. The turn on and off (discharging the input and the output capacitance) is predictable, and is the job of a gate driver integrated circuit.

It appears to me that while the effective input capacitance is reduced with HZO, the gate driver would need to be special to deal with the changing capacitance.

The article implies that the Berkeley team has been researching the use of feroelectrics in Si devices for 20 years. Are there Si mosfets in production with this material on the gate?