The fossil record is overwhelmingly a record of hard parts.
Bones, teeth and shells survive because they are mineral to begin with. Everything else — muscle, skin, fur, feathers, gut…
Maya Linton
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:…
Source: Wikipedia
Anyone who has left a tool in the garden knows what happens to iron. A gate goes orange, a railing flakes, and given a few seasons the metal is…
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…
There is a security feature in almost everyone's pocket that has been doing its job for over three hundred years, and almost nobody knows what it is for.
Look at…