There is a category of object that has to be got right first time, and a large bell is among the more demanding examples.
It is cast in one piece…
The distinction worth holding is between measuring and comparing. A ruler asserts a length and can be wrong about it. The instruments below compare one thing against another, or against…
Sand seems like the least plausible thing to run short of. It is the archetype of abundance — the thing in the metaphor about counting grains, covering deserts and beaches…
For most of the history of ocean navigation, a ship's crew could tell you how far north or south they were with reasonable confidence and had very little idea how…
The counterintuitive fact underlying all of this is that mixing two soft metals frequently produces something substantially harder than either, and the reason is geometric. Here are twelve.
1. Why…
Source: Wikipedia
There is a wall in Cusco that tourists queue to photograph because of one stone in it, which has twelve angles and fits its neighbours on every one of…