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  Watson and Crick discover  chemical structure of DNA On February 28, 1953, Cambridge University scientists James D. Watson and Francis H.C. Crick announce that they have determined the double-helix structure of DNA, the molecule containing human genes. Though DNA—short for deoxyribonucleic acid—was discovered in 1869, its crucial role in determining genetic inheritance wasn’t demonstrated until 1943. In the early 1950s, Watson and Crick were only two of many scientists working on figuring out the structure of DNA. California chemist Linus Pauling suggested an incorrect model at the beginning of 1953, prompting Watson and Crick to try and beat Pauling at his own game.  LISTEN NOW: HISTORY This Week Podcast: The DNA Debate On the morning of February 28, they determined that the structure of DNA was a double-helix polymer, or a spiral of two DNA strands, each containing a long chain of monomer nucleotides, wound around each other. According to their findings, DNA replicate...

ALFRED NOBEL , CHEMICAL ENGINEER  DISCOVERED DYNAMITE  BORN 1833 OCTOBER 21 Alfred Bernhard Nobel (/noʊˈbɛl/; Swedish: [ˈalfrɛd nʊˈbɛl] About this sound listen (help·info); 21 October 1833 – 10 December 1896) was a Swedish chemist, engineer, inventor, businessman, and philanthropist. Alfred Nobel Alfred Nobel Born Alfred Bernhard Nobel 21 October 1833 Stockholm ,  Sweden ,  Sweden–Norway Died 10 December 1896 (aged 63) Sanremo ,  Italy Resting place Norra begravningsplatsen ,  Stockholm , Sweden 59°21′24.52″N   18°1′9.43″E Occupation Chemist, engineer, inventor, businessman, philanthropist Known for Invention of  dynamite , Benefactor of the  Nobel Prize Signature Known for inventing dynamite, Nobel also owned Bofors, which he had redirected from its previous role as primarily an iron and steel producer to a major manufacturer of cannon and other armaments. Nobel held 355 different patents, dynamite ...

ALFRED NOBEL , CHEMICAL ENGINEER  DISCOVERED DYNAMITE  BORN 1833 OCTOBER 21 Alfred Bernhard Nobel (/noʊˈbɛl/; Swedish: [ˈalfrɛd nʊˈbɛl] About this sound listen (help·info); 21 October 1833 – 10 December 1896) was a Swedish chemist, engineer, inventor, businessman, and philanthropist. Alfred Nobel Alfred Nobel Born Alfred Bernhard Nobel 21 October 1833 Stockholm ,  Sweden ,  Sweden–Norway Died 10 December 1896 (aged 63) Sanremo ,  Italy Resting place Norra begravningsplatsen ,  Stockholm , Sweden 59°21′24.52″N   18°1′9.43″E Occupation Chemist, engineer, inventor, businessman, philanthropist Known for Invention of  dynamite , Benefactor of the  Nobel Prize Signature Known for inventing dynamite, Nobel also owned Bofors, which he had redirected from its previous role as primarily an iron and steel producer to a major manufacturer of cannon and other armaments. Nobel held 355 different patents, dynamite ...