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…
Source: Wikipedia
Archaeology depends on context. An object in the ground is surrounded by information — what layer it sat in, what was beside it, how it was arranged, what the…
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…
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…