There is a contradiction at the centre of making charcoal that explains everything about how it was done.
The wood has to be heated to a high temperature, and the…
There is an idea about sailing that seems obviously true and is only half the story.
The idea is that a sail is a bag that catches the wind and…
There is a small category of materials that are not assembled from anything, and felt is the oldest of them.
Almost every fabric is made of threads. Spinning turns loose…
There is a class of object that has to work with nobody supervising it, in public, permanently, and postboxes are among the clearest examples.
Before they existed, a letter had…
There is a common assumption about layered rocks that slate steadily breaks.
The assumption is that a rock which splits into sheets does so along the layers in which it…
Every other preservation method makes food hostile to spoilage organisms. This one removes them entirely and then locks the door. Here are fifteen consequences.
1. The Order Is Seal First,…