The most inhospitable places on Earth usually host some sort of life, from the super-hot hydrothermal vents on the ocean floor to the ice of Antarctica. While not as extreme, caves are also quite inhospitable. Complete darkness serves as a harsh restriction on what can – and can't – survive there.
Jellyfish have a diverse range of eating interests and locations, much like us. They are also fearsome predators. Interesting, right? Here are a few things about them that you might not have known.      
Japanese scientist Yoshinori Ohsumi was honored for discovering autophagy, which is a type of programmed cell death. Some cells in multicellular organisms, like animals and plants, choose to self-destruct for the greater benefit of the organism. This can occur for a variety of reasons.