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The development of the sailing ship and the ability to sail in unfavorable winds. It reached its apex just as the steamship became able to cross oceans.

How the bicycle went from dangerous curiosity to one of the most efficient forms of body-powered transportation. The development of canals, particularly the development of locks to move barges between high and low water levels.

Human gaits and their energy costs. The building of roads in various civilizations.

Pre-industrial methods of heating. For much of history open fires have been the norm, but at times we see such things as hypocausts (warm air drawn from a fire through under-floor passages) and various types of stoves, mostly brick or ceramic. Lighting also weak and flickering, based upon combustion.

Waterwheels and windmills -- humanity's first non-biological energy source for getting work done. But both depend upon environmental factors not under human control. Various kinds of water wheels, horizontal and vertical, and the necessities of managing water flow for maximum output. Their replacement by water turbines in the Nineteenth Century. Early Dutch and other windmills...

The urban horse, and the horrific conditions these animals had to toil under -- and the sheer volume of waste they produced.

The Nineteenth Century sees sophisticated scientific measurements of human muscle power vs horse and other animals. Unsurprising, given this is also the century of the steam engine, with railroads, steamboats and the earliest steam traction engines. But steam is tricky to handle and hard to subdivide into small engines for farming and household use. So muscle power remains important.

The limits of muscle power -- including the fact that you can't turn the prime movers on and off at need, so you have to feed and shelter them all year even if you only need them a few months. The use of various simple machines -- wheels, levers, etc. -- to gain more work out of the same amount of effort.

As farming becomes more intensive, draft animals need more and better food -- putting them in competition with the humans they're working for. Improvements in tools, such as the Prairie Queen, can do only so much as long as they're dependent upon muscle power -- but early steam engines are unsuitable for field work. Intensive human labor can actually reduce the quality of diets, until things backslide.

Improvements in draft horse breeding and implement construction result in increases in production. Early draft horses struggled in heavy clay soil, so oxen were still used, but larger draft horses could produce more power to cut through heavy soils with better plows (although John Deere's Prairie Queen remained in the future).

The consequences of energy constraints on muscle-powered irrigation and those on yields, which affects population densities.

An in-depth examination of animal traction, and the biomechanics of why the Bovidae can't produce as much power as equines (he looks primarily at horses, and doesn't really look at draft mules, mostly because draft horses breed and every mule is a one-shot). Why once the horsecollar spread to Europe, oxen were much less important. Then an examination of human-powered pumps: shadufs, corkscrews, bucket waterwheels...

Relative yields and nutrient contents of grains, legumes and meat, and how this affected agricultural practices in traditional societies. The problem that the power units (oxen, water buffalo, horses, etc) have to eat too, and land has to be set aside for fodder crops for them.

The constraints on foraging that make it far less rich than it might appear, and the drivers of the shift to farming. Hoe agriculture vs. plow agriculture, and the evolution of plow technology from simple scratch plows pulled by humans to moldboard and wheeled plows designed to be pulled by hooved animals -- oxen and later horses (after the invention of the horse collar).

The Fey continue their effort to take over the Protectorate

Food choices, food preferences and attitudes toward the work necessary to forage preferred vs. non-preferred foods. The taste for fatty animals vs. lean ones, at least partly because fat has more energy (viz polar bears eating the blubber of seals).

Studying foraging behaviors among present-day hunter-gatherers. Tropical rain forests may *look* rich in life, but it turns out that available calories aren't as common as appearances would suggest. Many are out of reach, requiring risky climbs or other techniques that have a high chance of leaving skilled foragers dead or badly injured. Oddly enough, available calories are more abundant in grasslands.

The fundamental problems of comparing the efficiencies of traditional and industrial agriculture. How to treat the inputs of fossil fuels (stored solar energy from ancient life) vs. the food and fodder of people using animal traction for power? The net energy cost of human labor whether using body-powered tools or externally powered tools and the human providing executive function. Natural history of genus Homo.

A troublesome portal.

Key concepts: Energy density, or why lionesses don't chase mice and humans don't subsist entirely on fruit. Power density, or how much can be generated in a given area. Conversion efficiency -- changing from one kind to another is inherently lossy, as generation or consumption involves various kinds of friction or inefficiency. Waste heat, waste volume, whatever.

An introduction on just how fundamental energy is to life -- the energy of nuclear fusion powering a G-class star 93 million miles from Earth, which provides light energy that powers photosynthesis of carbohydrates in plants, which in turn provides energy for the herbivores that eat them, and the carnivores that eat those animals.

On the road, in a very bad situation, thanks to a wild pig. A sow with a litter nearby, so a very different dynamic from that of an actual boar. And then the peasant village they took refuge in wants to rob them -- not greed, but desperation. And Harry Lefferts rescues them, in his own hillbilly version of "you won't like me when I'm angry."

Gussie retreats to the family estate, and discovers how strangely those satchels weigh upon her mind, even as the Fey continue their machinations and the investigator struggles to sort out just what's going on.

Eva sets her cap for Harry, and goes about seducing him as a matter of pride. She will not be one of his conquests, yet she will have her night with him -- and it looks like both of them are left wanting more.

What a difference a few days make -- between one chapter and the next, the disastrous events of 1635: The Papal Stakes take place, Harry Lefferts loses a big chunk of his team, including people Gerry and his brothers know, and comes back a very different man. Like Ken in Michael Z. Williamson's _The Weapon_, he'd gotten complacent in his success, and paid a terrible price.

Working out the logistics of following Lefferts on his mission.

A conversation with Harry Lefferts -- when he still has all his bravado intact, before that devastating moment when he failed, abysmally and some of his team died.

An encounter with the local Committee of Correspondence nearly goes very badly -- until Harry Lefferts steps in. This is still the brash, bulletproof Harry Lefferts of the early books, before his horrific failure to rescue Frank and Giovanna Stone -- which is one of the drawbacks of such a widely-branched 'verse: a story written later has a different impact because of knowledge of what will happen later.

No, this story isn't about a gangster or other criminal, but a woman who survived smallpox, and has been told that she is relegated to spinsterhood because of the scarring. And then the Ring of Fire deposited Grantville in the past and Everything Changed.

Discussion of religion in Brandenburg