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…
The technical term for this is path dependence: an early decision constrains everything afterwards, not because it was right but because too much was built on top of it. Here…
Almost nothing in the animal world does what this does.
A great many animals signal. They warn, threaten, court and call, and the signal refers to the here and now…
Here is a question that has been asked for centuries and is still argued about on television panel shows: why does a mirror swap left and right but leave up…
Source: Wikipedia
Most ancient monuments survive because they are made of something durable. Stone lasts. Metal lasts. Fired clay lasts. Their survival requires nothing from anybody.
There is a category of…
Weaving was invented independently in every inhabited part of the world, which is a strong indication that the problem has a limited number of solutions. Here are eleven of the…