Sometimes strange things happen. I heard about a woman who went to the beach with her kids in California. The kids collected some colored rocks and gave them to their mother. The mother put the rocks in her pocket and they all went home. Upon arrival at their home the rocks caught on fire while in her pocket and gave her second and third degree burns.
Scientists are now studying the rocks and think they contain phosphorus which is used to make matches. Some believe the phosphorus is human made and are trying to figure out where it came from.