Normally, levels of AST in the blood are low. Very high levels of AST (more than 10 times normal) are usually due to acute hepatitis, sometimes due to a viral infection. With acute hepatitis, AST levels usually stay high for about 1-2 months but can take as long as 3-6 months to return to normal.
A Baltimore mechanic named Charles Moncky invented the monkey wrench around 1858. The tool was originally named by using a âpurposeful misspellingâ of its inventorâs name, according to the Ferris State University Jim Crow Museum.
In 1790 an Englishman named Thomas Saint was granted a patent for a sewing machine design. But there is no proof that Saint, a cabinet maker, ever built his machine. Later when a prototype was built based on his descriptions, it didnât work. So he canât be considered as the one who invented the sewing machine.