Believe it or not gravity is not really a force, it is an acceleration and on Earth it is about 32 feet/sec2. This same science principle applies in decelerating devices like parachutes and parafoils. The parachute decelerates or slows down the fall of the object.
What is a .DS_Store or ._ AppleDouble file? .DS_Store files are created by OS X to store metadata about folders and files including viewing options, icon positions and color labels. ._ AppleDouble files are created by the OS X when an application adds resource data or metadata to a file on a disk whose format doesn't support resources or metadata.
At WWDC 2014, Apple debuted iCloud Drive, a cloud storage service where you can backup any type of file, and access anywhere you have an Internet connection.pple iCloud Drive will be available for Mac, iOS, and Windows 8; no word yet if there is a desktop client for Windows 7.