this gif show  the FIRST microscopic, slow-motion footage of an Box-Jellyfish firing venom

The box jellyfish, have such powerful venom that they can kill an adult human. And to inject it into you, jellyfish and anemones use nematocysts, which are terrifying organelles that pretty much work like hyperdermic needles filled with venom. When you brush up against the tentacle of a jellyfish or anemone, these nematocysts fire out of the tentacle and spray venom.

The new episode of Smarter Every Day, filmed at James Cook University, is helping scientists understand how jellyfish bring down humans with their venom

Recently, two new species of box jellies were found in Australia, all indicate that these new species are toxic.