Gutta percha is the hardened latex of the Palaquium gutta tree, originally native to Malaysia. This is a natural “thermoplastic” substance, meaning it can be softened with heat and shaped into a...
Rats have long been associated with and blamed for the spread of plague, a disease that has killed over 200 million people throughout the past two millennia. The Black Death, a bubonic plague...
There were no Guinness Records back in 1772, but if there were, Joseph Priestley would certainly have been awarded one for discovering eight new gases in a single year. That is a record that will...
Four hundred years ago, Belgian physician Johann Baptist Van Helmont was persecuted by the Roman Catholic Church for promoting the use of the “Powder of Sympathy.” The idea had been originally...
Is it possible to be literally scared to death? Today, it’s commonly understood that mental stress and negative emotion can contribute to physical health problems including high blood pressure,...
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