# What's Under Your Feet in New York City? — Practical Engineering

- Source: Practical Engineering (practical.engineering), All rights reserved
- By: Wesley Crump
- Published: 2026-07-21
- Read it at the publisher: <https://practical.engineering/blog/2026/7/21/whats-under-your-feet-in-new-york-city>
- Why the text is not here: This work is under copyright, so it is described here and read at the publisher.
- Page: <https://sprout.rootsofreason.org/r/practical-engineering/what-s-under-your-feet-in-new-york-city-practical-engineering>