I always feel stupid when I go back, read one of my posts, and find a typo or some other error. It happens to me all the time.
In fact, there is a general rule for my posts. A post is not done until I have gone back and edited it to correct some minor mistake.
But at least I can go back and correct my typos unlike the people at NASA who made this sign.
I wonder who is going to have to live that one down.
(Spotted on NASA Watch.)