Hartmut Michel
Born 18 Jul 1948
German biochemist who, along with Johann Deisenhofer and Robert Huber, received the Nobel Prize for Chemistry in 1988 for their determination of the three-dimensional structure of certain proteins that are essential for photosynthesis. They are the first to succeed in unravelling the full details of how a membrane-bound protein is built up, revealing the structure of the molecule atom by atom. The protein is taken from a bacterium which, like green plants and algae, uses light energy from the sun to build organic substances. All our nourishment has its origin in this process, which is called photosynthesis and which is a condition for all life on earth.
Roald Hoffmann
Born 18 Jul 1937
Polish-born American chemist, corecipient, with Fukui Kenichi of Japan, of the Nobel Prize for Chemistry in 1981 for their independent investigations of the mechanisms of chemical reactions. His work aims at theoretically anticipating the course of chemical reactions. It is based on quantum mechanics (the theory whose starting point is that the smallest building blocks of matter may be regarded both as particles and as waves), which attempts to explain how atoms behave. Orbital interaction and symmetry relations between molecules or parts of molecules are fundamental to this theory of conservation of orbital symmetry in chemical reactions.
Thomas S. Kuhn
Born 18 Jul 1922; died 17 June 1996.
Thomas S(amuel) Kuhn was an American historian of science, MIT professor, noted for The Structure of Scientific Revolutions (1962), one of the most influential works of history and philosophy written in the 20th century. His thesis was that science was not a steady, cumulative acquisition of knowledge, but it is "a series of peaceful interludes punctuated by intellectually violent revolutions." Then appears a Lavoisier or an Einstein, often a young scientist not indoctrinated in the accepted theories, to sweep the old paradigm away. Such revolutions, he said, came only after long periods of tradition-bound normal science. "Frameworks must be lived with and explored before they can be broken,"
Born 18 Jul 1869; died 5 Dec 1954
One of the most eminent crystallographers and mineralogists of the world, he lived in a period of revolutionary developments in mineralogical science. At the
Hendrik Antoon Lorentz
Born 18 Jul 1853; died 4 Feb 1928.
Dutch physicist and joint winner (with Pieter Zeeman) of the Nobel Prize for Physics in 1902 for his theory of the influence of magnetism upon electromagnetic radiation phenomena. The theory was confirmed by findings of Zeeman and gave rise to Albert Einstein's special theory of relativity. From the start, Lorentz made it his task to extend James Clerk Maxwell's theory of electricity and of light. Already in his doctor's thesis, he treated the reflection and refraction phenomena of light from this new standpoint. His fundamental work in the fields of optics and electricity revolutionized conceptions of the nature of matter. In 1878, he published an essay relating the velocity of light in a medium, to its density and composition..
Jean Robert Argand
Born 18 Jul 1768; died 13 Aug 1822.
Swiss mathematician who was one of the earliest to use complex numbers, which he applied to show that all algebraic equations have roots. He invented the Argand diagram - a geometrical representation of complex numbers as a point with the real portion of the number on the x axis and the imaginary part on the y axis.«
Born 18 Jul 1720; died 26 Jun 1793
English cleric and pioneering naturalist, known as the "father of English natural history." Over the course of 20 years of his observations and two colleagues' letters, he studied a wide range of flora and fauna seen around his hometown of Selborne, Hampshire. In 1789, he published this studious work. His book The Natural History and Antiquities of Selborne contained observations of nature drawn from life. The book has been in print continuously since 1789, and is the fourth most published book in the English language.
Born 18 Jul 1689; died 13 Apr 1728.
British astronomer (Royal Observatory at
Robert Hooke
Born 18 Jul 1635; died 3 Mar 1703.
English physicist, born Freshwater,