Some types of scorpions are harmless. But cross paths with the wrong one and you could be in serious trouble—the poison can cause the heart to stop and the lungs to fill with fluid, often killing the victim. Stings like these kill 3,000 people per year, and the venom from the Brazilian yellow scorpion, or Tityus serrulatus, is one of the most potent, affecting 1.2 million people annually. Although an anti-venom can often stop the toxins from taking their full effect, it can sometimes cause an allergic reaction in victims, again putting their lives at risk. Now researchers have figured out how the toxins affect the body on a molecular level, which has led them to a new way to treat the scorpion stings, according to a study published today in Nature Communications.