Most debris on the ground is not hazardous to bare feet — Born to

Debris and other discarded items often found on the ground or walkways are usually unlikely to do any harm to someone's bare feet.

NASA approved the launch of a space telescope that could save humanity from an asteroid crash

Geomorphological information mapping of debris-covered ice landforms using Google Earth: An example from the Pico de Posets, Spanish Pyrenees - ScienceDirect

The Forgotten Foot

8 remedies for cracked heels and what causes them

Most debris on the ground is not hazardous to bare feet — Born to Live Barefoot

To Walk the Earth in Safety (2022) - United States Department of State

What is earthing? And is it good for you? – Barefoot Scientist

Pollution

Why do my feet get so dirty walking around my house barefoot? - Quora

Trading Lives for Profit: How the Shipping Industry Circumvents Regulations to Scrap Toxic Ships on Bangladesh's Beaches

Progressive Insurance Cancelling California (more info in comment) : r/bayarea