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.
Between 1700 and 1900 a number of life-sized automatons were created including a famous mechanical duck made by Jacques de Vaucanson that could crane its neck, flap its wings and even swallow food. Henry Ford installs the worldâs first moving conveyor belt-based assembly line in his car factory.