Also because they're free. I plan to install a brick sidewalk in the back yard, and with these I might just have enough. Of course, if I were to actually try to start digging the path and laying those bricks in this weather, I would die of heat exhaustion.
EDIT: Whew, finished the second load, showered in COLD water, and am feeling moderately more human.
Also, I just learned that today's heat index in Lawrence reached 112°. Holy fried-Kansans, Batman! And this lovely weather is scheduled to continue through Wednesday.