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.
Shortest day of the year = National Short Girl Appreciation Day! This day may seem like another made-up holiday, like national 'Teddy Bear Picnic Day' on July 10th, but there actually is a reason (albeit a tenuous one) for the celebration of short women. Today, December 22nd, marks the shortest day of the year.