First Fact
For all that they lack backbones, a heart, blood, a brain or gills and are about 95 water, jellyfish can kill. The box jellyfish, Chironex fleckeri, has a bell (the jellyfish’s head) that’s about a foot across, attached to 550 feet of tentacles. 76 people have died from contact since with the box jellyfish since 1884. As Flannery writes, “if just six yards of tentacle contact your skin, you have, on average, four minutes to live — though you might die in just two.”
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