Most Helpful Customer Reviews
|
|
7 of 7 people found the following review helpful:
5.0 out of 5 stars
The mysteries of time revealed, December 29, 2007
In this series of evocative essays, Turney explains how our continually changing concept and use of time affects how we view the world and ourselves. Using a sprightly prose style, he opens with a description of various calendar systems developed by the ancients. It was difficult for them to reconcile the irregularities of lunar month, solar year and constantly changing heavens. Egypt, Babylon and Rome all struggled to maintain some control over the calendar. Many forms of adjustment were implemented but precision was difficult, if not impossible. The device of the "Leap Year" to adjust for the lack of precision was the best humans could do until the invention of the atomic clock.
The atom, with many versions and intricacies, has proven an effective tool in time-keeping. From measuring split seconds to granting us some insight on circumstances billions of years ago, "atomic clocks" in their various forms have provided many solutions to long unresolved problems. Turney's chapter on the Shroud of Turin is but one example of a practical application. Its status as a forgery went undetected for centuries until radiometric measurements revealed its true age.
A grander sweep of time, yet one with significant implications for today's world are the chapters on the eruption of Santorini in the Mediterranean and what led to the Ice Ages. Thera has been described as the cause of the elimination of the Minoan Empire. Based on Crete four thousand years ago, the Minoans operated an intricate network of trade routes in the region and were a highly sophisticated and successful people. Yet, they disappeared almost instantly around thirty-five hundred years ago. The author examines the evidence that Santorini might have been responsible. Further back in time, he reviews another threat to society in the form of invasive glaciers. Atoms play a role even in ice as accumulations of oxygen isotopes tell the story of climate change events. Even though some of those shifts rely on Earth's orbit and tilt relative to the sun, their signature rests with those oxygen atoms.
Human societies have their own fluctuations, as Turney notes in other chapters. The dating of hominid fossils has contributed a great deal in deriving both the time and place of our origins. Rocks surrounding bones tell us when the fossils lived, and tiny grains of pollen indicate the type of environment they lived in. One of the enigmas of science is why there is but one species of upright-walking ape remaining - us. There have been competitors for living space, most notably the Neanderthals. But at least one other species co-habited the planet with us. The "Hobbit" fossil found on an Indonesian island resided there only 18 thousand years ago, as Turney's own dating research revealed. The possibility that there may be remnant populations yet to be found raises compelling questions.
Turney's book may seem light-hearted at first glance, but it rests on serious work by dedicated workers. Dating the rocks was a difficult science in the 18th and 19th Centuries, but technology has provided astonishing new insights on our world. There's much to be learned and the author's effective presentation makes this book a stimulating introduction to this field. [stephen a. haines - Ottawa, Canada]
|
|
|
6 of 6 people found the following review helpful:
4.0 out of 5 stars
What Do We Know, and When Did We Know It?, October 28, 2006
"Bones, Rocks and Stars" is an engaging and wide-ranging romp through "the science of when things happened." Each chapter covers a single topic, such as how the calendar evolved, when King Arthur would have lived (if he existed), when the Santorini volcano erupted in the Mediterranean, when the Shroud of Turin was forged (pulling no punches there), when (and why) the earth experiences ice ages, and when (exactly) the dinosaurs were wiped out by an asteroid impact. Turney's style is approachable, so even carbon 14 dating, the precession of the equinoxes, Milankovitch cycles and other challenging topics are clearly explained.
If you enjoy enlightening and surprising books like Malcolm Gladwell's "Tipping Point" and "Blink," Cordelia Fines' "A Mind of Its Own" and Michael Leavitt's "Freakonomics," you may find this little book to be an eye opening and entertaining look at how scientists have figured out when things happened.
|
|
|
5 of 5 people found the following review helpful:
4.0 out of 5 stars
Very enjoyable, July 20, 2008
After the first two chapters, this book get really interesting. The first two chapters are about how the different calendars used throughout history are synchronized and whether King Arthur actually existed. Not much science there.
But once we get into science (as opposed to history) things get interesting. For example, the chapter on the Shroud of Turin was great and the way tree rings can be used to date things is fascinating.
Unfortunately, there is very little science here. Instead, this book talks about the stories surrounding various scientific controversies.
I was much more interested in learning about the technical details of things like potassium argon dating, thermoluminesence, and electron spin resonance. But I wasn't gonna get that. Here's the disclaimer from the author when he starts talking about isotopes: "Unfortunately, to understand the [age of the Earth], it's going to be necessary to cross to the other side. I'll try and keep [references to isotopes] to the absolute minimum."
Unfortunately? "The Other Side"? Jimminy Cricket! I learned about isotopes in seventh grade, for crying out loud. I wish someone would write about science as if I actually made it through high school. I want to know about why these methods work, their limitations and when they should be used.
And I think I have the right to be disappointed. The book is subtitled: The Science of When Things Happened." Overall, though, it is quite interesting.
|
|
|
Most Recent Customer Reviews
|