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.
Families across Britain enjoy the longest day of the year on Friday 21 June. It is the summer solstice of 2013. We get the most hours of daylight because of the position of the Earth in relation to the Sun. But the solstice does not necessarily fall on the same day each year. And in some parts of the world the Sun does not set at all.