Today's Astronomy Picture of the Day is titled, "April Fools Day More
Intense On Mars." I spent more time than I care to admit to looking
at the picture for a knee-slappin' joke, but I can't find any. Is
there some extremely subtle aspect of this picture that's funny, or is
the joke on us for looking for something funny?

http://antwrp.gsfc.nasa.gov/apod/ap040401.html

Tom