- quick-scan media (percentage interval -- 0.05% to 100% check of video) divide duration by percent

- scan bpm and key sig  https://github.com/aubio/aubio https://github.com/tyiannak/pyAudioAnalysis

- CLI eda tool

- CLI incremental diff (SQLITE, NDJSON, CSV)

compare 100 rows at a time using primary key

show the differences between files

- CLI incremental book reading

- CLI recursive financial planner

- CLI reverse flight search

- CLI city abacus

- CLI UNLI Neighborhoods
