This is an image at large size:
It doesn't look large, but I can assure you it is, because it's under this URL: http://i.stack.imgur.com/0Vajul.jpg
This is the same image again, but an added 's' before '.jpg' to make it smaller (in appose to an added 'l':
Adding 's' to the second occurrence makes both of them small, even though the first one has a 'l'. Why is this so?