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...development of GPS (formally known as NAVSTAR GPS) in 1973. The military launched the first GPS satellite in 1978 and completed the system in 1995. GPS uses a "constellation" of 24 satellites orbiting 12,000 miles high, each circling the globe every 12 hours. The 2,000-lb satellites broadcast radio signals to Earth with information about their location and the exact time the signal was transmitted (each satellite carries an atomic clock). By calculating the difference between radio signals received from four or more satellites, GPS receivers on the ground can determine their own location, speed and elevation with...
...This article contains a table. Please see hardcopy of magazine or PDF.] HUBBLE WEBB ORBIT 353 miles from Earth 1 million miles from Earth PRIMARY-MIRROR SIZE 7.9 ft. in diameter 21.3 ft. in diameter LENGTH 44 ft. 72 ft. WEIGHT 24,500 lb. 14,300 lb...
Netbooks are small, stripped-down laptops that are inexpensive ($400-ish) and lightweight (3 lb.--ish). But their screens and keyboards are too petite for my taste, and they tend to lack the all-important DVD drive. That said, the idea behind netbooks isn't a bad one: since just about every type of program we need is freely available online (from e-mail to PowerPoint knockoffs), why pay for expensive computers that run expensive software programs? Better yet, when you create a document using one of these free services, you can't lose it; the document lives...
...After childhood polio paralyzed her from the neck down, North Carolina native Martha Mason, 71, spent more than 60 years living in a 7-ft., 880-lb. iron lung that allowed her to breathe without tubes. Despite her condition, Mason graduated with honors from Wake Forest College (now a university) and published a book...
Pack Light. Starting in July, US Airways will increase its fee for the first checked bag to $20, from $15; the second-bag fee rises to $30, from $25. But if your bags exceed 50 lb., you'll be hit with a whopping $70 fee for the first checked bag and $80 for the second...