Transcript of Cast Iron: An Invention of Ancient China. Mass-production began in the Han dynasty. At the time of its invention, cast iron had many uses. Since the discovery of steel, iron (both cast and wrought) has become less common, as steel is generally stronger.
Asafoetida is a plant. It has a bad smell and tastes bitter. That probably explains why it is sometimes called âdevilâs dung.â. People use asafoetida resin, a gum-like material, as medicine. Asafoetida resin is produced by solidifying juice that comes out of cuts made in the plantâs living roots. Asafoetida is used for breathing problems including ongoing (chronic) bronchitis, H1N1 swine flu, and asthma.
Silver sulfadiazine. Silver sulfadiazine, sold under the brand Silvadene among others, is a topical antibiotic used in partial thickness and full thickness burns to prevent infection. Tentative evidence has found other antibiotics to be more effective and therefore it is no longer generally recommended. Common side effects include itching and pain at the site of use.