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Sit all the way back in the chair with the knees level with or below the thighs. Both feet should be on the floor. The arms may rest on the desk or chair arms, but make sure you do not slouch. If you need to bend or lean forward, do so from the waist. popular Apache server, on their home computers. Anyone can download Linux for free or can obtain it on disk for only a marginal fee. Torvalds created the kernel—or heart of the system—“just for fun,” and released it freely to the world, where other programmers helped further its development.

The central processing unit (CPU) of a computer is where almost all computing takes place in all computers including mainframes, desktops, laptops, and servers. The CPU of almost every computer is contained on a single chip. How is the speed of a CPU measured? Separate from the “real-time clock” which keeps track of the time of day, the With the invention of the silicon chip, computers went from CPU clock sets the tempo for the procesbulky and expensive machines filled with vacuum tubes to much smaller and affordable pieces of technology that sor and measures the transmission speed average people could purchase.

A pixel (from the words pix, for picture, and element) is the smallest element on a video display screen. A screen contains thousands of pixels, each of which can be made up of one or more dots or a cluster of dots. On a simple monochrome screen, a pixel is one dot; the two colors of image and background are created when the pixel is switched either on or off. Some monochrome screen pixels can be energized to create 47 Handy Science 2/16/11 11:26 AM Page 48 different light intensities to allow a range of shades from light to dark.

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