Flames are the least useful part of a fire for cooking. Almost everything below is a technique for using something other than the flame itself - embers, stones, hot walls,…
Picture a world map. North is at the top, south at the bottom, and it feels less like a convention than a fact — as settled as the ground being…
Source: Wikipedia
There is a category of problem that looks impossible from the outside and turns out to be merely extremely difficult, and decipherment sits squarely in it.
When Egyptian hieroglyphs…
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…
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
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