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.
Monday may feel like the longest day of the week, but this Monday will actually be the longest day of the year. That is, it will have the most daylight of the year. Monday, June 20, is the summer solstice, the day on the calendar with the most daylight for those in the Northern Hemisphere. Here a few things to know as we begin what many consider the first day of summer. 1.