The wheel is frequently described as the great invention. The wheel-and-axle pair is the invention; a disc that rolls is obvious, and attaching it usefully is not. Here are twelve…
The useful way to think about paint is as a delivery system. The colour cannot stick to anything by itself, so the entire technology is about getting it onto a…
The useful habit at any old doorway is to look at the threshold and the hinges before the door itself, because those two features carry most of the information. Here…
The useful way to look at any blade is as a solution to a specific material. Something dense, something soft, something with skin, something that must not be crushed -…
The thing worth understanding first is that a rope is not a long thing. It is an enormous number of short things arranged so that pulling on the assembly squeezes…
The useful way to think about any bond is as a chain with three links - surface, adhesive, surface - and a chain fails at whichever link is weakest. Here…