Fun facts about jellyfish:

-In isolated environments, jellyfish can evolve to be sting-free - like the ones my friend and I are smooching in the photo

-The life cycle of a jellyfish is fascinating! They can alternate between polyp and medusa phases. During the polyp phase the jelly is generally a planted stalk with a tentacled upward-facing mouth, but it can also ride around on bits of plankton or fish. The medusa phase is what you picture when you think about jellies.

-Jellyfish can reproduce sexually or asexually.

-Some of them might even be immortal!

-Jellyfish were around before the dinosaurs, they've been to outer space, and in some parts of Asia they are considered to be a culinary delicacy.

Thanks to my friend, Sarah, for the picture and this smithsonian blog for the facts.