Videos and companion posts

How the systems around us really work

Each Wiser Dots video asks one question about the world. Each post here goes further: the parts we cut, the numbers behind the story, and every source.

Watch first: Why Do Modern Trains Still Crash?14:55

Posts

Railways · Companion to the video Why trains still crash: the gaps the safety systems miss Tempi, Purley, Cuenca and the 1889 law behind railway signals: what our video on train crashes left out, in plain words, with every source.

Geography · Companion to the video What lies under Canada's biggest lakes 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.