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.
On October 9, 1893, the day designated as Chicago Day, the fair set a world record for outdoor event attendance, drawing 751,026 people. The debt for the fair was soon paid off with a check for $1.5 million (equivalent to $39,505,556 in 2015).