I want to know the answer to the following question:
Since when has the number of base pairs of DNA in the human genome been known?
All the background I'm provided with is that "Although the number of base-pairs of DNA in the human genome has been known since the 1960s, the estimated number of genes has changed over time as definitions of genes, and methods of detecting them have been refined.". Is that enough to answer the question?
Answer: yes