# Wiser Dots

> How the systems around us really work, one question at a time. Each long video on https://www.youtube.com/@WiserDots has a companion post here that covers what the video left out, with every claim tied to a quoted source.

## Posts

- [Why trains still crash: the gaps the safety systems miss](https://wiserdots.com/why-do-modern-trains-still-crash.md): Tempi, Purley, Cuenca and the 1889 law behind railway signals: what our video on train crashes left out, in plain words, with every source.
- [What lies under Canada's biggest lakes](https://wiserdots.com/why-do-canadas-lakes-line-up.md): Why Canada has so many big lakes, how deep Great Slave Lake really goes, a fault that slid 75 km, and land that is still rising: what our lakes video left out.

## Optional

- [All posts in one file](https://wiserdots.com/llms-full.txt)
- [About](https://wiserdots.com/about/)