People with darker skin colors require more exposure time. Another point to remember is that this natural method does not work equally well at all latitudes and seasons, or in all people. If you are uncertain of the amount of sunshine you need, you can have your vitamin D levels tested.
The 'official' War in Europe began in Poland on September 1, 1939. Some historians have argued that the war began much earlier with the Spanish Civil War but September 1 â¦ st, 1939 is the date accepted when the U.K., France, and Commonwealth nations declared war on Germany in response to the Polish invasion.
In Europe, the war began with Hitler's attack on  Poland, September 1st, 1939. Britain and France had defense  treaties with Poland regarding a possible German attack, and  declared war on Germany two days later.  The US was drawn into the war late in 1941 after Pearl Harbor.owever, it is officially accepted that World War 2 â¦ started when German troops invaded Poland on 1 September 1939. The United States entered the conflict after the Japanese attack on Pearl Harbour on 7 December 1941.