...the sea squirt, when young, seeks a rock to which it can anchor
itself. Once it finds a rock, it will stay there the rest of its life.
When it has been anchored, it no longer needs its brain, so it eats
it. sort of like getting tenure...
-- Molly Ball
Very few things actually get manufactured these day because in an
infinitely large Universe, such as the one in which we live, most things one
could possibly imagine, and a lot of things one would rather not, grow
somewhere....