@libbyheeren.bsky.socialNic ( @niccrane.bsky.social) taught us all about FREAKING PARQUET FILES on the #DSLab, which are wayyyyy cooler than I realized.
Parquet files:
Preserve data types
Are fast & small
Are column-oriented so you can read just 1 col if wanted!
& Positron displays'em out-the-box!