Half-life: Measurement of the time it takes for one-half of a radioactive substance to decay.Radioactive decay: The predictable manner in which a population of atoms of a radioactive element spontaneously disintegrate over time.Title Page, Table of Contents, Figures & Tables, Forward, & Acknowledgments: 1: 2a: 2b: 3: 4: 5: 6: 7a: 7b: A: 2018 Bill Lindsey. Viewers are encouraged, for personal or classroom use, to download limited copies of posted material. Author reserves the right to update this information as appropriate.Dating techniques are procedures used by scientists to determine the age of an object or a series of events.Similarly, pollen grains released by seed-bearing plants became fossilized in rock layers.If a certain kind of pollen is found in an archaeological site, scientists can check when the plant that produced that pollen lived to determine the relative age of the site.
Please note that we do not control and cannot guarantee the relevance, timeliness, or accuracy of the materials provided by other agencies or organizations.They are listed here because they appear to the author to be of possible utility in the continued pursuit of the goals of this website.It is not intended to be a complete listing of websites dealing with historic bottles, but is an attempt to get some of the more useful and/or interesting ones listed in one location.We also are not endorsing outside agencies and organizations by linking to them." Liquor/Spirits Bottles Wine & Champagne Bottles Beer & Ale Bottles Soda & Mineral Water Bottles Medicinal/Chemical/Druggist Bottles Food Bottles & Canning/Fruit Jars Household Bottles (non-food related) Miscellaneous & Foreign Bottles Exceptionally useful tools for determining what a particular bottle shape or type was likely used for are period bottle/glass makers illustrated catalogs.This website provides complete scanned copies (jpegs) of several never before re-printed bottle makers catalogs covering a wide array of bottle types.Cosmic rays: Invisible, high-energy particles that constantly bombard Earth from all directions in space.