This will give you peace of mind, in that you can verify whether or not a professor has submitted a letter. It also gives you a polite way to ask a follow-up: I see that you haven't checked off the spreadsheet for X and it's due in three days.
Of the nearly 200 countries out there, the Brits have invaded all but 22. That is just about 90% of all countries! Mongolia, the Ivory Coast, Bolivia and Sweden are among the selective group of making it to 2013 without a British invasion. Here is the map showing where (pink) the British have invaded.
The Vikings first invaded Britain in AD 793 and last invaded in 1066 when William the Conqueror became King of England after the Battle of Hastings. The first place the Vikings raided in Britain was the monastery at Lindisfarne, a small holy island located off the northeast coast of England. Some of the monks were drowned in the sea, others killed or taken away as slaves along with many treasures of the church.