1. Notation for logic and linguistics à la the best mathematical notation: arithmetical, algebraic, etc. My notational system, which clarifies logic, linguistics, and the relationship between logic and linguistics, works as an artificial language. See here for that work.
2. Some of the most controversial questions in the sciences of human action and the human mind. See here.

For a high-level summary (along with some autobiographical context):

1. The ideal social calculator
2. Intellectual isolation
3. My intellectual ambitions
4. Hume, Mises, and Humean-Misesian linguistics
5. Logic, linguistics, and logico-linguistics
6. Beyond logic, linguistics, and logico-linguistics
7. The pure logic of space, time, and action