Over the past decade, Allstate Protection Plans has revolutionized the product protection category. We’ve done it with innovation, new technology, and by following the golden rule: treat others as you ...

Frequency combs are light sources with a spectrum that comprises a series of sharp, equally spaced lines. The frequencies of these lines are known to a very high degree of accuracy, which makes ...

For the reader’s convenience, following is an alphabetical list of selected acronyms and abbreviations used in this handbook. Designations for footnotes to science service allocations are then listed.