This is the subject of a classic joke about tenure: “The juvenile sea squirt wanders through the sea searching for a suitable rock or hunk of coral to cling to

This is the subject of a classic joke about tenure: “The juvenile sea squirt wanders through the sea searching for a suitable rock or hunk of coral to cling to and make its home for life. For this task, it has a rudimentary nervous system. When it finds its spot and takes root, it doesn't need its brain anymore, so it eats it! It's rather like getting tenure.” http://www.goodreads.com/quotes/52415-the-juvenile-sea-squirt-wanders-through-the-sea-searching-for http://www.goodreads.com/quotes/52415-the-juvenile-sea-squir...