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…
The question worth asking at the entrance to any tunnel is what problem made digging cheaper than going around. Here are seventeen, and the answers.
1. Pedestrian River Tunnels
Source:…
The mistake is treating each journey as a separate problem to solve. The system has a logic, and learning the logic once is far quicker than working out ten routes…
Almost none of these are about a single person doing a small thing. They are about what a small thing becomes when several million people do it in a year.…
The feature that makes a fjord a fjord is the sill at its entrance - a shallow threshold of rock and debris left where the glacier terminated. Water inside is…
The single most useful realisation is that the famous view has been photographed by everyone who came before you, from the same place, and you cannot improve on it by…