Famous for his work with fruit flies, Morgan discovered an important relationship between certain genes on chromosomes and their part in determining inherited characteristics. He won the Nobel Prize in 1933.  

In Great Britain, the first blood transfusion was completed using human blood.  The patient died two days later.

British researcher who perfected in-vitro fertilization along with Patrick Steptoe. Their work resulted in the birth of Louise Brown in July 1978, the first "test-tube baby."

The father of modern infectious theory, creator of the Pasteurization process, vaccines for diptheria, rabies, cholera, plague, anthrax and TB, died at the age of 72

Fermi, considered one of the fathers of the atomic age, expert on nuclear radiation and decay, who was awarded the Nobel Prize in 1938 in Physics, was born this day in 1901.

Charles Richter, creator of the Richter Earthquake Scale, died at the age of 85 on this day in 1985

The British-French collaborative supersonic plane, Concorde, flew faster than Mach I on this day in 1969.

Sir William Ramsay born this day in 1852. The Scottish chemist, discoverer of neon, krypton, and xenon and co-discoverer of argon, radon, calcium, and barium was awarded the Nobel Prize in Chemistry in 1904

Frank Pantridge, Irish cardiologist who invented the portable cardiac defibrillator was born this day in 1916. It was first put into use in an ambulance in 1965.

The Soviet Union launched Sputnik, the first man-made satellite into orbit around the earth on this day in 1957, eventually leading to the space race between the US and the USSR.

Steve Jobs, co-founder and CEO of Apple Computer, dies at the age of 56 on this day in 2011 from pancreatic cancer.

Norwegian adventurer Thor Heyerdahl, who led the Kon-Tiki and Ra transoceanic sails was born this day in 1914. He was trying to prove that Polynesia's first settlers could have come from South America. This theory has fallen out of scientific favor.