What might we run into as we expand beyond Earth and into the stars? As we explore our own solar system and beyond, it seems inevitable that we'll run into aliens ... and what they've left behind. Alien artifacts: what might they reveal about us as we try to unlock their secrets? What might they reveal about the universe? In this anthology, nineteen of today's leading science fiction and fantasy authors explore how discovering long lost relics of alien civilizations might change humanity. Join Walter H. Hunt, Julie Novakova, David Farland, Angela Penrose, S.C. Butler, Gail Z. Martin & Larry N. Martin, Juliet E. McKenna, Sharon Lee & Steve Miller, Andrija Popovic, Jacey Bedford, Sofie Bird, James Van Pelt, Gini Koch, Anthony Lowe, Jennifer Dunne, Coral Moore, Daniel J. Davis, C.S. Friedman, and Seanan McGuire as they discover the stars and the secrets they may hold—both dark and deadly and awe-inspiring.

A two-channel digital photometer system installed at the AFCRL Geopole Observatory, Thule, Greenland is described, and data from the system over the 1972 to 1973 optical observing season are presented. Results show that intensities of (OI)(lambda)5577 A can be obtained over long periods of time under varied observational conditions with high reliability. The system makes it economically feasible to study long- and short-term variations and correlations of fast time resolution optical data. (Author).

This one-stop reference gives firefighters and emergency response personnel immediate access to the page number where chemical data on nearly 1,000 substances can be located in 13 of the most frequently-used references. It speeds up research time by alphabetizing chemicals by name and with UN/NA numbers.

The parasitoid flies of the Tachinidae family are an important and diverse (>10,000 species) lineage of insects. However, tachinids are not well studied partially due to their confusing classification and taxonomy. DNA sequences were obtained from twenty tribal representatives of Tachinidae, along with eight outgroups in order to phylogenetically reconstruct the superfamilial, subfamilial and tribal relationships of Tachinidae. Seven gene regions of six genes (18S, 28S, COI, CAD, Ef1a, and TPI) were sequenced for each taxon (6214 bp total). Both maximum likelihood and Bayesian methods were used to infer phylogenies. The Sarcophagidae and Oestridae were usually reconstructed as monophyletic. Calliphoridae was paraphyletic with Pollenia typically being sister to Tachinidae. The Rhinophoridae were found embedded within an otherwise monophyletic Tachinidae, a unique finding. Subfamilies of Tachinidae were generally related in a (Tachininae + Exoristinae) + (Phasiinae (Dexiinae)) manner. The problematic Tachininae genera Strongygaster (Strongygasterini) and Ceracia (Acemyini) were placed into their original subfamilies with high confidence. These findings led to a new hypothesis about a slow evolution into the parasitoid habit.