Black widows are the most venomous spiders in North America. Their venom is about 15 times stronger than rattlesnake venom. They use a chemical called alpha-latrotoxin which overwhelms the nerve cells and causes intense pain. This causes human nerve cells to dump all it’s signaling chemicals at once! The bite can then begin the onset of swelling, severe cramping, sweating and chills. Female widow spiders have unusually large venom glands and their bite can be particularly harmful. Black…