Slate industry in Wales
, Wales, about 1910.
The slate industry in Wales began during the Roman period when slate was used to roof the fort at Segontium , now Caernarfon . The slate industry grew slowly until the early 18th century, then expanded rapidly until the late 19th century, at which t more
Isaac Newton
Sir Isaac Newton FRS () (4 January 1643 – 31 March 1727 ) [ OS : 25 December 1642 – 20 March 1727 ] was an English physicist , mathematician , astronomer , natural philosopher , and alchemist . His treatise Philosophiæ Naturalis Principia Mathematica , published in 1687, des more
Hydrochloric acid
Hydrochloric acid is the aqueous solution of hydrogen chloride gas (H Cl ). It is a strong acid , the major component of gastric acid , and of wide industrial use. Hydrochloric acid must be handled with appropriate safety precautions because it is a highly-corrosive liquid . more
Helicobacter pylori
Helicobacter pylori () is a Gram-negative , microaerophilic , and acidophilic bacterium that infects various areas of the stomach and duodenum . Many cases of peptic ulcer s, gastritis , duodenitis , and perhaps some cancer s are caused by H. pylori infections. However, man more
Verbascum thapsus
Verbascum thapsus (; Great Mullein or Common Mullein) is a species of mullein native to Europe , northern Africa and Asia , and introduced in the Americas and Australia .
It is a hairy biennial plant that can grow to 2 m or more tall. Its small yellow flowers are dens more