The external layer of the human skin is called the epidermis and it replaces itself approximately every 27 days through shedding, which is known as exfoliation. Only this outer or surface layer of skin is replaced during the exfoliation process.
Gregor Mendel, the Moravian Augustinian monk who founded the modern science of genetics. Mendelian inheritance is a type of biological inheritance that follows the laws originally proposed by Gregor Mendel in 1865 and 1866 and re-discovered in 1900. These laws were initially very controversial.
1950 First successful freezing of bull semen at -79Â°C for later insemination of cows was accomplished. 1952 First animal cloning: Robert Briggs and Thomas J. King cloned northern leopard frogs. 1953 Francis Crick and James Watson, working at Cambridge's Cavendish Laboratory, discovered the structure of DNA.