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In military parlance, a gun is a muzzle or breech-loaded projectile-firing weapon. There are various definitions depending on the nation and branch of service. A "gun" may be distinguished from other firearms in being a crew served weapon such as a howitzer or mortar, as opposed to a small arm like a rifle or pistol, but there are exceptions, such as the USAF's GUU5/P. At one time, land based artillery tubes were called cannon and sea-based naval cannon were called guns...

Human embryology is the study of human development during the first eight weeks from gametogenesis (sperm and oocyte development) pre-conception through fertilization (conception of sperm and oocyte in the ampulla arm where the fallopian tube and ovary adjoin) up to and including the 8th week after implantation of the zygote (fertilized egg) in the uterus. After the 8th week of implantation, the developing embryo becomes a fetus...

A T-shirt (T shirt or tee) is a thin, knitted shirt which is pulled on over the head to cover most of a person's torso. A T-shirt is usually buttonless and collarless, with a round neck and short sleeves. In a 2008 USA Today survey, results revealed approximately 81% of the U.S. population have worn or will wear a T-shirt by the time of the next presidential election; 9,000 men and women were polled...