Gu Man, director of the China Academy of Chinese Medical Sciences, explained that the existence of these needles represent ...

This is because most cast-iron skillets fall into one of two categories: very cheap or very expensive. There’s not much in ...

This article was originally published with the title “ Conversion of Cast Iron Into Wrought Iron—The Heaton Process ” in Scientific American Magazine Vol. 20 No. 14 (April 1869), p. 218 doi ...