It is not as if farming brought a great improvement in living standards either. A typical hunter-gatherer enjoyed a more varied diet and consumed more protein and calories than settled people, and took in five times as much viatmin C as the average person today.

"[Traveling] makes you realize what an immeasurably nice place much of America could be if only people possessed the same instinct for preservation as they do in Europe. You would think the millions of people who come to Williamsburg every year would say to each other, "Gosh, Bobbi, this place is beautiful. Let's go home to Smellville and plant lots of trees and preserve all the fine old buildings." But in fact that never occurs to them. They just go back and build more parking lots and Pizza Huts."

One consequential change is that people used to get most of their calories at breakfast and midday, with only the evening top-up at suppertime. Now those intakes are almost exactly reversed. Most of us consume the bulk — a sadly appropriate word here — of our calories in the evening and take them to bed with us, a practice that doesn't do any good at all.

Three hundred types of mussel, a third of the world’s total, live in the Smokies. Smokies mussels have terrific names, like purple wartyback, shiny pigtoe, and monkeyface pearlymussel. Unfortunately, that is where all interest in them ends. Because they are so little regarded, even by naturalists, mussels have vanished at an exceptional rate. Nearly half of all Smokies mussels species are endangered; twelve are thought to be extinct.

This ought to be a little surprising in a national park. I mean it’s not as if mussels are flinging themselves under the wheels of passing cars. Still, the Smokies seem to be in the process of losing most of their mussels. The National Park Service actually has something of a tradition of making things extinct. Bryce Canyon National Park is perhaps the most interesting-certainly the most striking-example. It was founded in 1923 and in less than half a century under the Park Service’s stewardship lost seven species of mammal-the white-tailed jackrabbit, prairie dog, pronghorn antelope, flying squirrel, beaver, red fox, and spotted skunk. Quite an achievement when you consider that these animals had survived in Bryce Canyon for tens of millions of years before the Park Service took an interest in them. Altogether, forty-two species of mammal have disappeared from America's national parks this century.

I was especially riveted by an amateur photograph in Herrero’s book, taken late at night by a camper with a flash at a campground out West. The photograph caught four black bears as they puzzled over a suspended food bag. The bears were clearly startled but not remotely alarmed by the flash. It was not the size or demeanor of the bears that troubled me — they looked almost comically unagressive, like four guys who had gotten a Frisbee caught up a tree — but their numbers. Up to that moment it had not occurred to me that bears might prowl in parties. What on earth would I do if four bears came into my camp? Why, I would die, of course. Literally shit myself lifeless. I would blow my sphincter out my backside like one of those unrolling paper streamers you get at children’s parties — I daresay it would even give a merry toot — and bleed to a messy death in my sleeping bag.

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Just being kind, for instance. A study in New Zealand of diabetic patients in 2016 found that the proportion suffering severe complications was 40 per cent lower among patients treated by doctors rated high for compassion. As one observer put it, that is ‘comparable to the benefits seen with the most intensive medical therapy for diabetes’.

It wasn't until we dropped him at his university dormitory and left him there looking touchingly lost and bewildered amid an assortment of cardboard boxes and suitcases in a spartan room not unlike a prison cell that it really hit home that he was vanishing out of our lives and into his own.

When the Duke [W.J.C. Scott-Bentinck] died, his heirs found all of the aboveground rooms devoid of furnishings except for one chamber in the middle of which sat the Duke's commode. The main hall was mysteriously floor less. Most of the rooms were painted pink. The one upstairs room in which the Duke had resided was packed to the ceiling with hundreds of green boxes, each of which contained a single dark brown wig. This was, in short, a man worth getting to know.

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Out of the thirty thousand types of edible plants thought to exist on Earth, just eleven — corn, rice, wheat, potatoes, cassava, sorghum, millet, beans, barley, rye, and oats — account for 93 percent of all that humans eat,

I wondered idly what the builders of Stonehenge would have created if they’d had bulldozers and big trucks for moving materials and computers to help them design. What would they have created if they had had all the tools we have? Then I crested the brow of the hill with a view down to the visitor center, with its café and gift shop, its land trains and giant parking lot, and realized I was almost certainly looking at it.