SHOES
The earliest known shoes date from about 8000 to 7000 BCE and were found in Oregon, USA in 1938. However, the materials used for making shoes do not normally last for thousands of years, so shoes were probably in use long before this. Physical anthropologist Erik Trinkaus believes he has found evidence that the use of shoes began in the period between about 40,000 and 26,000 years ago, based on the fact that the thickness of the bones of the toes (other than the big toe) decreased during this period, on the premise that going barefoot results in greater bone growth before this period.

Types of Shoes
There is a large variety of shoes available for women, in addition to most of the men's styles being more accepted as unisex. Some broad categories are:Pumps, known in the US and UK as ballerinas, ballet pumps or skimmers, are shoes with a very low heel and a relatively short vamp, exposing much of the instep. They are popular for warm-weather wear, and may be seen as more comfortable than shoes with a higher heel.High heels may be shoes with heels 2 inches (5 cm) or higher. They are often seen as having more sex appeal than low heels (see article for discussion) and are thus commonly worn by women for formal occasions or social outings.

Sneaker boot and sneaker pump are shoes that looks like an athletic shoe, but is equipped with a heel, making it a kind of novelty dress shoe.Men's and women's athletic shoes and special function shoes often have less difference between the sexes than in dress shoes. In many cases these shoes can be worn by either sex. Emphasis tends to be more on function than style.Orthopedic or "comfort" shoes are made with pedorthic and anatomically-correct comfort qualities, such as padded removable footbeds, wide toe boxes and arch support are made especially for those with problematic feet.Work shoes are designed to stand heavy wear, to protect the wearer, and provide high traction. They are generally made from sturdy leather uppers and non-leather outsoles. Sometimes they are used for uniforms or comfort by nurses, waitresses, police, military personnel, etc. They are commonly used for protection in industrial settings, construction, mining, and other workplaces. Protective features may include steel-tipped toes and soles or ankle guards.

Cultures & Traditions
In most parts of the world (Asia, Eastern Europe, parts of the Middle East and Africa, much of Northern Europe and Canada, as well as Alaska) it is customary to remove shoes when entering a house. In some areas of the United States, especially the Midwest, it is expected that visitors remove their shoes unless a host specifically invites them to leave their shoes on. People do this to avoid bringing dirt, mud or snow into the house. For some societies, including those in Asia, indoor footwear may be provided for guests.In the Middle East, parts of Africa, Korea and Thailand, it is considered rude to show the soles of the feet to others (even accidentally, such as by crossing the legs). In addition, in Thailand, it is an extreme insult for the foot, socks, or shoes to touch someone's head or be placed over it. source : wikipedia