(Encyclopedia) era, period of historic time. In geology, it is the name applied to large divisions of geological process, e.g., Paleozoic era (see geology). In chronology an era is a period reckoned…
The computer age began when ENIAC (Electronic Numerical Integrator and Calculator) was completed in 1945. The first multipurpose computer, ENIAC set speed records with an amazing 5,000 additions…
The Modern EraWeatherRadar and SatellitesRadar—Scanning the SkiesDoppler—the New GenerationSatellites—a Far-Out LookThe Modern EraPutting It All Together Satellites are capable of providing a wealth…
(Encyclopedia) Mesozoic eraMesozoic eramĕzˌəzōˈĭk [key] [Gr.,=middle life], major division of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 65 to 225 million years ago.…
Geological timescaleTriassic period: 250–200 million years agoJurassic period: 200–145 million years agoCretaceous period: 145–65 million years agoDinosaurs roamed the planet for about 165 million…
(Encyclopedia) Cenozoic eraCenozoic erasēnəzōˈĭk, sĕn– [key], last major division of geologic time (see Geologic Timescale, tablegeologic timescale, table) lasting from 65 million years ago to the…
(Encyclopedia) Paleozoic eraPaleozoic erapāˌlēəzōˈĭk [key], a major division (era) of geologic time (see Geologic Timescale, tablegeologic timescale, table) occurring between 570 to 240 million years…
Source: National Institute of Allergy and Infectious Diseases, National Institutes of Health. The problem. In the course of a year, individuals in the United States suffer one billion colds,…
The debate intensifies over standards in education Related Links Common Core State Standards Initiative New Evaluations Are Raising the Stakes for Teachers School…
