Old Stone Age, the earliest period of human development and the longest phase of mankind's history. It is approximately coextensive with the Pleistocene geologic epoch, beginning about 2 million years ago and ending in various places between 40,000 and 10,000 years ago, when it was succeeded by the Mesolithic period.
Insulator Companies . List Includes U. S. and Foreign Companies. and Company Catalogs in the Files of the. Insulator Research Service. R=∞ Home The original company listing was put together as a searching guide for a research trip to the Smithsonian Natural History Museum catalog archives in August 2006.
A stone tool is, in the most general sense, any tool made either partially or entirely out of stone.Although stone tool-dependent societies and cultures still exist today, most stone tools are associated with prehistoric, particularly Stone Age cultures that have become extinct.
Painting - Techniques and methods: Whether a painting reached completion by careful stages or was executed directly by a hit-or-miss alla prima method (in which pigments are laid on in a single application) was once largely determined by the ideals and established techniques of its cultural tradition.