The 20th century witnessed an explosive growth in science and technology—more scientists are alive today than have lived during the entire course of earlier human history. New inventions including spaceships, computer chips, lasers, and recombinant deoxyribonucleic acid (DNA) have opened pathways to new fields such as space science, biotechnology, and nanotechnology. Modern seismographs and submarines have given earth and ocean scientists insights into the planet's deepest and darkest secrets. Decades of weather science, aided by satellite observations and computer modeling, now produce long-term, global forecasts with high probabilities (not certainties) of being correct. At the start of the century, science and technology had little impact on the daily lives of most people. This had changed radically by the year 2000.

The purpose of Twentieth-Century Science, a new seven-volume book set, is to provide students, teachers, and the general public with an accessible and highly readable source for understanding how science developed, decade by decade, during the century and hints about where it will go during the early decades of the 21st century. Just as an educated and well-informed person should have exposure to great literature, art, and music and an appreciation for history, business, and economics, so too should that person appreciate how science works and how it has become so much a part of our daily lives.

Students are usually taught science from the perspective of what is currently known. In one sense, this is quite understandable—there is a great deal of information to master. However, very often a student (or teacher) may ask questions such as "How did they know that?" or "Why didn't they know that?" This is where some historical perspective makes for fascinating reading. It gives a feeling for the dynamic aspect of science. Some of what students are taught today will change in 20 years. It also provides a sense of humility as one sees how brilliantly scientists coped earlier with less funding, cruder tools, and less sophisticated theories.

Science is distinguished from other equally worthy and challenging human endeavors by its means of investigation—the scientific method— typically described as a) observations b) hypothesis c) experimentation with controls d) results, and e) conclusions concerning whether or not the results and data from the experiments invalidate or support the hypothesis.

In practice, the scientific process is not quite so "linear." Many related experiments may also be explored to test the hypothesis. Once a body of scientific evidence has been collected and checked, the scientist submits a paper reporting the new work to a peer-reviewed journal. An impartial editor will send the work to at least two reviewers ("referees") who are experts in that particular field, and they will recommend to the editor whether the paper should be accepted, modified, or rejected. Since expert reviewers are sometimes the author's competitors, high ethical standards and confidentiality must be the rule during the review process.

If a hypothesis cannot be tested and potentially disproved by experiment or mathematical equations it is not scientific. While, in principle, one experiment can invalidate a hypothesis, no number of validating experiments can absolutely prove a hypothesis to be "the truth." However, if repeated testing, using varied and challenging experiments by diverse scientists, continues to validate a hypothesis, it starts to assume the status of a widely accepted theory. The best friend a theory can have is an outstanding scientist who doubts it and subjects it to rigorous and honest testing. If it survives these challenges and makes a convert of the skeptical scientist, then the theory is strengthened significantly. Such testing also weeds out hypotheses and theories that are weak. Continued validation of an important theory may give it the stature of a law, even though it is still called a theory. Some theories when developed can revolutionize a field's entire framework—these are considered "paradigms" (pronounced "paradimes"). Atomic theory is a paradigm. Advanced about 200 years ago, it is fundamental to understanding the nature of matter. Other such paradigms include evolution; the "big bang" theory; the modern theory of plate tectonics, which explains the origin of mountains, volcanoes, and earthquakes; quantum theory; and relativity.

Science is a collective enterprise with the need for free exchange of information and cooperation. While it is true that scientists have strong competitive urges, the latter half of the 20th century witnessed science's becoming increasingly interdisciplinary. Ever more complex problems, with increasing uncertainty, were tackled and yet often eluded precise solution.

During the 20th century, science found cures for tuberculosis and polio, and yet fears of the "dark side" of science (e.g., atomic weapons) began to mount. Skepticism over the benefits of science and its applications started to emerge in the latter part of the 20th century even as its daily and positive impact upon our lives increased. Many scientists were sensitive to these issues as well. After atomic bombs devastated Hiroshima and Nagasaki, some distinguished physicists moved into the life sciences and others started a magazine, now nearly 60 years old, The Bulletin of the Atomic Scientists, dedicated to eliminating the nuclear threat and promoting

Preface xv peace. In 1975, shortly after molecular biologists developed recombinant deoxyribonucleic acid (DNA), they held a conference at Asilomar, California, and imposed voluntary limits on certain experiments. They encouraged adoption of regulations in this revolutionary new field. We are in an era when there are repeated and forceful attempts to blur the boundaries between religious faith and science. One argument is that fairness demands equal time for all "theories" (scientific or not). In all times, but especially in these times, scientists must strive to communicate to the public what science is and how it works, what is good science, what is bad science, and what is not science. Only then can we educate future generations of informed citizens and inspire the scientists of the future.

The seven volumes of Twentieth-Century Science deal with the following core areas of science: biology, chemistry, Earth science, marine science, physics, space and astronomy, and weather and climate. Each volume contains a glossary. Each chapter within each volume contains the following elements:

• background and perspective for the science it develops, decade by decade, as well as insights about many of the major scientists contributing during each decade

• black-and-white line drawings and photographs

• a chronological "time line" of notable events during each decade

• brief biographical sketches of pioneering individuals, including discussion of their impacts on science and the society at large

• a list of accessible sources for Additional Reading

While all of the scientists profiled are distinguished, we do not mean to imply that they are necessarily "the greatest scientists of the decade." They have been chosen to represent the science of the decade because of their outstanding accomplishments. Some of these scientists were born to wealthy and distinguished families, while others were born to middle-and working-class families or into poor families. In a century marked by two world wars, the cold war, countless other wars large and small, and unimaginable genocide, many scientists were forced to flee their countries of birth. Fortunately, the century has also witnessed greater access to the scientific and engineering professions for women and people of color, and ideally all barriers will disappear during the 21st century.

The authors of this set hope that readers appreciate the development of the sciences during the last century and the advancements occurring rapidly now in the 21st century. The history teaches new explorers of the world the benefits of making careful observations, of pursuing paths and ideas that others have neglected or have not ventured to tread, and of always questioning the world around them. Curiosity is one of our most fundamental human instincts. Science, whether done as a career or as a hobby, is after all, an intensely human endeavor.

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