Jellyfish! We know them, we love them, we just don't want to swim near them. This week, we learned that when they swarm, jellyfish may be influenced by the lunar cycle and the temperature, possibly useful information for a power company in Israel that was looking into how to stop the creatures from clogging their power station's sea-water filters.
Swarming or not, though, they're fascinating creatures, so let's learn a fact or three about them.
First, what are they made of? Not much, it looks like. The gossamer beauties consist of three layers: the protective, outer epidermis; the stretchy middle layer called the mesoglea, the animal's gelatinous "umbrella"; and the innermost gastrodermis, basically the lining for its gut. The mesoglea makes up most of what passes for the body. Truth be told, jellyfish are made up of about 95% water.
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