Octopus arms keep from getting all tangled up in part because some kind of chemical in octopus skin prevents the tentacles' suckers from grabbing on.
That was the surprise discovery of scientists who were trying to understand how octopuses manage to move all their weird appendages without getting tied in knots.
Unlike humans, octopuses don't have a constant awareness of their arms' locations. It's kind of like the eight arms have minds of their own. And as an octopus arm travels through the water, its neighboring arms are constantly in reach.
For a cake the Germans call "the king of cakes" and the Japanese call "the ultimate wedding cake," the baumkuchen doesn't really look like a cake or behave like one. But it more than makes up for its oddities with rich flavor, history and symbolism.
It resembles a hollowed cross-section of a craggy tree trunk, or a planet's rings, depending on how you make it. It can have up to 21 delicate, sugary stratums, which give it a light yet chewy texture.
Office visits are the bread and butter of many physicians' practices. Medicare pays for more than 200 million of them a year, often to deal with routine problems like colds or high blood pressure. Most require relatively modest amounts of a doctor's time or medical know-how.