The length of the DNA of the human is approximately 20 billion kilometrs, if you pull it in a single chain. German scientists discovered DNA in the 19th century. The destination of the DNA was not clear. But after some time during the development of new technologies new generations of scientists realised that it was one of the most important discovery. In the 20th century American researchers have found that DNA is responsible for genetic information of any being.

Katya Perets