Common Design Features: All spring aligners are available for both arches. Standard design is 3-3, although 4-4 is very common & often used when canine correction is desired. Wraparound designs are also available with Mushroom & Super Spring designs.
exists and is an alternate of . The most generally accepted scientific theory states that the first humans (defined as members of the genus Homo) originated in Africa. The oldest known fossil of a human ancestor (a female Ardipithecus ramidus specimen nicknamed Ardi, 3.2 million years old) at a site called Aramis in the Middle Awash region of the Afar Desert in Ethiopia.
Early humans first migrated out of Africa into Asia probably between 2 million and 1.8 million years ago. They entered Europe somewhat later, between 1.5 million and 1 million years. Species of modern humans populated many parts of the world much later. For instance, people first came to Australia probably within the past 60,000 years and to the Americas within the past 30,000 years or so. The beginnings of agriculture and the rise of the first civilizations occurred within the past 12,000 years.