A sail is any type of surface intended to move a vessel, vehicle or rotor by being placed in a wind—in essence a propulsion wing. Sails are used in sailing.

The earliest known depictions of sails are from ancient Egypt around 3200 BCE, where reed boats sailed upstream against the River Nile's current. Ancient Sumerians used square rigged sailing boats at about the same time, and it is believed they established sea trading routes as far away as the Indus valley. The proto-Austronesian words for sail, lay(r), and other rigging parts date to about 3000 BCE when this group began their Pacific expansion.Greeks and Phoenicians began trading by ship by around 1,200 BCE.

Square sails mounted on yardarms perpendicular to the boat's hull are very good for downwind sailing; they dominated in the ancient Mediterranean and spread to Northern Europe, and were independently invented in China and Ecuador. Although fore-and-aft rigs have become more popular on modern yachts, square sails continued to power full-rigged ships through the Age of Sail and to the present day. Triangular fore-and-aft rigs were invented in the Mediterranean as single yarded lateen sails and independently in the Pacific as the more efficient bi sparred crab claw sail, and continue to be used throughout the world. During the 16th-19th centuries other fore-and-aft sails were developed in Europe, such as the spritsail, gaff rig, jib/genoa/staysail, and Bermuda rig, improving European upwind sailing ability.

Jeb Corliss (born March 25, 1976 near Santa Fe, New Mexico) is a professional skydiver and BASE jumper. He has jumped from sites including Paris' Eiffel Tower, Seattle's Space Needle, and the Petronas Twin Towers in Kuala Lumpur, Malaysia.

Jeb Corliss is co-founder of 3 Triple 7, a clothing label.

He was also the original host of the Discovery Channel series Stunt Junkies, appearing in 13 episodes, but was fired by Discovery as a result of his arrest (below).

On September 25, 2011 Corliss jumped out of a helicopter at 6,000 feet and glided through a 100-ft wide archway in Tianmen Mountain in Zhangjiajie, Hunan Province, China, landing with a parachute on a nearby bridge.

In April 2006, Jeb Corliss attempted to BASE jump off the observation deck of the Empire State Building, while wearing a camera, but was restrained by building security and arrested by the NYPD. As a result, Corliss received three years probation and 100 hours community service, which was at one point overturned by a Manhattan state judge on the basis that Corliss "was experienced and careful enough to jump off a building without endangering his own life or anyone else’s". This sentence was affirmed in January 2009. Corliss was later permanently banned from setting foot in the Empire State Building.