By Newsbreak Producer Matthew Veeran - From the flesh-eating venom of the executioner wasp to a microscopic jellyfish that induces a terrifying sense of "impending doom" - researchers are documenting the outer limits of human agony in order to crown the world's most painful sting. This investigation into the animal kingdom's most potent chemical defenses found that some survivors even liken their experiences to heavyweight boxing rounds and active volcanoes. Matthew finds out more in this week's Greenscene...