1 From the secondhand account, the reader gets more background information about what the Oregon Trail was. 2  From the firsthand account, the reader gets a better understanding why it was so dangerous.
Printers generally age more by the number of pages printed rather than by pure years. The rule of thumb has always been whatever the recommended volume is (for instance 5000 pages per month for a P3005) multiplied by say five or six years so about 300,000 pages would be the life expectancy of the printer.
Laser Printers. Normally laser printers are found in offices, however the cost for laser printers has become so reasonable that it is possible to own a professional quality laser printer in your own home. The average resolution of today's laser printer is 1200 x 1200 DPI. This resolution will give you very high quality document printouts. The majority of laser printers on the market today can print an average of 20 PPM (or more) in (black/monochrome).