Evidence shows that humans have been grinding flour from seeds to make soups, bread, cookies and other kinds of edibles for some 30,000 years. Probably longer, in fact.

A new photo essay on the history of flour illustrates what ancient grinding equipment looks like, how it worked, and what archaeological evidence there is to support the ancient art of making flour.

• The Ancient Art of Making Organic, Edible Flour, a photo essay

Cotton (Gossypium spp), is, according to the USDA, the single most important textile fiber in the world, and accounts for some 40% of all the fibers produced.

Archaeologists and related scientists have ascertained that cotton was domesticated several times, in both the old and new worlds. The first event was in the Indus Valley of present-day Pakistan and India, where cotton fiber evidence at Mehrgarh and Mohenjo-Daro dates to ca. 5000 BC.

In a pair of recent articles, Contributing Writer Nicoletta Maestri investigates the origins of this amazingly useful crop.

• Cotton History
• Cotton History in Ancient Peru

Anyone who has been a reader of these pages for very long knows I have a thing about ancient roads. I can't really explain it, except to say that it interests me that in certain places, a public thoroughfare is built and rebuilt and rebuilt, but remains in the same geographical location for hundreds of years. Walking one of these ancient pathways is a little like time travel.

Oh well, enough justification, silly or not. Here's the latest peep into the ruins of Pompeii.

• The Streets of Pompeii: A Walking Tour
• More on Roman Roads
• Walking Tour of the House of the Faun
• More Ancient Roads

This week, PBS airs "Caveman Cold Case", the latest episode of the long-running series Secrets of the Dead, featuring archaeological evidence of survival cannibalism by Neanderthals some 49,000 years ago.

"Caveman Cold Case" describes archaeological and paleoanthropological research at El Sidrón and Gorham's Cave, two Neanderthal sites that together provide insight into how good--and very bad indeed--life for Neanderthals could get.

I have to say Secrets of the Dead, the series which blends history and science for PBS, is on occasion a little over the top for starchy old me, a little over-emphatic maybe on the non-scientific aspects of the past. But it's always entertaining, and it is undeniable that the episodes make the connection between science and history come alive. "Caveman Cold Case" is an excellent example of communicating scientific research to the public, and I recommend it heartily.

Secrets of the Dead: "Caveman Cold Case" premieres this Wednesday, May 15, 2013 on PBS. Check local listings

• Read the full review of Caveman Cold Case
• Read more about El Sidrón
• Or more about Gorham's Cave