HEATKEYS

The United States Parachute Association and its 32,000 member skydivers enjoy and promote safe skydiving through parachuting training, rating, and competition programs. USPA represents parachute jumping from aircraft and helps keep skydivers in the a...

A comprehensive calculation website, which aims to provide higher calculation accuracy, ease of use, and fun, contains a wide variety of content such as lunar or nine stars calendar calculation, oblique or area calculation for do-it-yourself, and hig...

Dave Andersen

The Physics Classroom is an online interactive tutorial of basic physics concepts. The lessons use an easy-to-understand language to present common physics principles discussed in a first-year high school physics course.

Get in-depth coverage of current and future trends in technology, and how they are shaping business, entertainment, communications, science, politics, and culture at Wired.com.

Green Harbor Publications is the sponsor of the Free Fall Research Page, the Writing 69th home page, and the 44th Bomb Group Roll of Honor page

Space and astronomy news

Music, movies, TV, shows and now friends. Get connected on iTunes 10.

Official site of Guinness World Records, the ultimate authority on record-breaking achievement, providing information about superlative facts and feats as well as record processing application for all those who want to set or break a Guinness World R...