For this to happen the DNA must replicate itself exactly. When DNA replicates itself and the cell divides both of the new cells that are produced contain the exact same DNA (barring mutations) which means both new cells can code to make the same proteins.
Americium was first produced in 1944 by the group of Glenn T. Seaborg at the University of California, Berkeley. Although it is the third element in the transuranic series, it was discovered fourth, after the heavier curium.
Einsteinium is a synthetic element (not found in nature) with an atomic number 99 and symbol Es. The element was discovered in 1952 in Berkley, California, by G.G. Harvey, A. Ghiorso, S.G. Thompson, and G.R. Choppin. In fact, einsteinium was discovered through a thermonuclear explosion test, which was conducted in the Pacific.