However, while UVB rays are responsible for the health benefits of sunshine, tanning salons are most concerned with the UVA rays. The reason for this is that overexposure to UVB rays, which affect the surface layers of skin, quickly causes the skin to burn.
This article is about the war that started in 2003 and ended in 2011. For the initial invasion, see 2003 invasion of Iraq. For the ongoing war in Iraq, see Iraqi Civil War (2014âpresent). For previous wars in Iraq, see Iraq War (disambiguation).
Historians do not agree on the exact date when World War II began. Most consider the German invasion of Poland on September 1, 1939, to be the beginning of the war. Others say it started when the Japanese invaded Manchuria on September 18, 1931. Others even regard World War I, which culminated in the Peace with the Central Powers in 1921 and World War II as parts of the same conflict, with only a breathing spell in between.