War stories usually begin with steel, fire, or gas. This one begins with a fungi toxins so small it can hide in flour, dust, or fill a bomb. According to the U.S. Environmental Protection Agency, “Biothreat agents are either biological microorganisms like viruses,...

For nearly a century, the deaths that followed the opening of King Tutankhamun's tomb were chalked up to supernatural revenge — an ancient pharaoh striking back from beyond the grave. But science tells a different story. The real curse may have been a toxic mold that...