Posted by ARJUN on Dec. 11, 2012, 3:06 p.m.
21 – The molecular structure of DNA was first determined by Watson and Crick in 1953.
22 – The first synthetic human chromosome was constructed by US scientists in 1997.
23 – The thermometer was invented in 1607 by Galileo.
24 – Alfred Nobel invented dynamite in 1866.
25 – Wilhelm Rontgen won the first Nobel Prize for physics for discovering X-rays in 1895.