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).
January 9, 201714309 views. The typical date agreed upon by historians to answer the question of when did World War 2 start is September 1st, 1939. This is the date that Germany invaded Poland; however, France and Great Britain did not declare war on the Germans until September 3rd.