Yesterday was the day I decided to transplant pepper seedlings into their bed in the greenhouse. I had six each of seventeen varieties, and having planned it out well in advance, knew I had exactly enough to plant a double row in an 82 foot bed. NOT having written it down anywhere, I seemed to recall that the spacing between plants was one foot. As I was planting, I thought "my, they look terribly close", but happily kept right on going. When over half of them were in their new homes, I looked up and realized that I was not yet halfway down the row. Ooops. Quickly doing the math in my head, I realized the spacing should have been 18 inches between plants. Thinking how lucky it was that I had not yet watered them in, I started over. When I was done, I had maybe about four feet of empty row left. Clearly this was not my day for math. Too bad, because planting something twice is my limit. And besides, I'm sure I'll be able to find a way to put that extra row space to good use.
Lesson for the day: When planning in advance, write it down for future reference. And use the flippin' calculator.