The Federalist papers were a series of documents written by several of the Founders of the U.S as a set of guidelines as to what form the new Federal government should take. Number 51 spoke of the importance of "checks & balances" between the branches of government.
The Federalist Papers : No. 51
The Structure of the Government Must Furnish the Proper Checks~~~~~~~~~~~~~~~~~~~
and Balances Between the Different Departments
From the New York Packet. Friday, February 8, 1788.
Area 51 is the site of a secret government base where top-secret aircraft are developed. There are even claims that extraterrestrial spacecraft have been captured and are located there as well as the bodies of aliens who crashed in Nevada in 1947.
A possible planet has been discovered around the star known as 51Pegagus.
James Watson and Francis Crick stumbled upon the structure of DNA, but only by making use of the discoveries of many scientists who came before them, including Rosalind Franklin. Rosalind Franklin took a series of X-ray photographs of DNA to try to determine its structure, one of those photos known as Photo 51.
In the Periodic Table of Elements, number 51 is Antimony.
Antimony is increasingly being used in the semiconductor industry in the production of diodes, infrared detectors, and Hall-effect devices.