A blood blister forms when skin and small blood vessels are damaged without breaking the skin. Trapped beneath the skin surface is some blood and skin fluid. Blood blisters are commonly caused by accidents in which the skin is pinched by a tool or a heavy weight, or they may occur from constant rubbing back and forth.
1 Sunshine hours in Chicago, Illinois range between 3:42 per day in December & 10:14 for each day in July. 2  The longest day of the year is 15:02 long and the shortest day is 8:57 long.  The longest day is 6:04 longer than the shortest day.
Which month has the longest day of the year? The longest day of the year occurs on the summer solstice, which takes place in June in the Northern Hemisphere and December in the Southern Hemisphere. The solstice occurs between June 20 and 22 or between December 20 and 23 each year.