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.
Summer Solstice and Strawberry Moon: Everything you need to know about the longest day of the year. The summer solstice is the longest day of the year, a day falling around late June when there are approximately 17 hours of light. The name comes from the Latin solstitium meaning âsun stands stillâ.