The Treaty of Tordesillas only specified the line of demarcation in leagues from the Cape Verde Islands. It did not specify the line in degrees, nor did it identify the specific island or the specific length of its league.
Watson-Crick has discovered the current-structure of DNA in 1953.The famous double-helix structure of DNA has its own significance. There are basically four nucleotide bases, which make up the DNA. Adenine (A), Guanine (G), Thymine (T) and Cytosine(C).
But Watson did not take notes, and remembered the numbers incorrectly. Instead, it was Franklin's famous photograph 51 that finally revealed the helical structure of DNA to Watson and Crick in 1953.