January 20, 2009 Science Source

Alexander von Humboldt (1769-1859), German naturalist and explorer who traveled to Central and South America, Russia and Siberia. He discovered the co...

Galen, the ancient Greek physician and writer, who lived from around 129 to around 200 A.D. His teachings on anatomy were central to European medicine...

An illustration of Robert Bunsen (March 31, 1811 - August 16, 1899), the German chemist who perfected the burner that was invented by Michael Faraday...

An illustration of Robert Bunsen (March 31, 1811 - August 16, 1899), the German chemist who perfected the bunsen burner that was invented by Michael F...

Girolamo Fracastoro (1478-1553), the Italian logician and physician who proposed an early theory of the germ origin of disease. Having been Lecturer i...

Illustration of the discovery of Archimedes' principle of hydrostatics. The principle states that a body immersed in a fluid will displace a volume of...

Ivan Petrovich Pavlov (1849-1936), Russian physiologist and experimental psychologist wo received the 1904 Nobel Prize for his work on the physiology...

Epidemics: The Plague of 1665.

Newton analyzing the Ray of light. Colorized version of 9L6458.

A wood engraving of Aristotle (384-322 BC), the ancient Greek philosopher who wrote on everything from poetry to physics, rhetoric, logic, zoology, bi...

Sir Isaac Newton (1642-1727), English physicist, mathematician and alchemist. As a mathematician he discovered the binomial theorem and developed diff...

Sir Isaac Newton, President of the Royal Society and an English mathematician, philosopher, and scientist. Colorized version of 9A8188.

Dutch physicist and astronomer Christiaan Huygens (1629-93), the inventor of the pendulum clock. The idea of using a pendulum to measure time had been...

Johann Kepler (1571-1630), German astronomer. Kepler formulated the three fundamental laws of planetary motion based on the detailed observations of t...

Louis Pasteur (1822-1895), French scientist after whom pasteurization is named. Colorized version of 9A8153.

Thomas Hunt Morgan (1866-1945). Recipient of the 1933 Nobel Laureate in Medicine for his discoveries of the role played by the chromosome in heredity....

Alexander Von Humboldt (1769-1859), a German naturalist, was renowned for exploring Latin America and laying the ground work for physical geography an...

Marie Curie (1867-1934, nee Marya Sklodowska), Polish-French physicist, in her laboratory. With her husband Pierre, she isolated the radioactive eleme...

Marie Curie (1867-1934, nee Marya Sklodowska), Polish-French physicist, in her laboratory. With her husband Pierre, she isolated the radioactive eleme...

Marie Curie (1867-1934, nee Marya Sklodowska), Polish-French physicist, in her laboratory. With her husband Pierre, she isolated the radioactive eleme...

Marie Curie (1867-1934, nee Marya Sklodowska), Polish-French physicist, in her laboratory. With her husband Pierre, she isolated the radioactive eleme...

Marie Curie (1867-1934, nee Marya Sklodowska), Polish-French physicist. With her husband Pierre, she isolated the radioactive elements polonium and ra...

Marie Curie (1867-1934, nee Marya Sklodowska), Polish-French physicist. With her husband Pierre, she isolated the radioactive elements polonium and ra...

Mary E. Britton (1855-1925), US medical pioneer. Britton graduated from the American Missionary College in Chicago, USA, and worked as a doctor from h...

Mary E. Britton (1855-1925), US medical pioneer. Britton graduated from the American Missionary College in Chicago, USA, and worked as a doctor from h...

Maria Gaetana Agnesi (1718-1799), Italian scholar and mathematician. Agnesi was one of 24 children born to a mathematics professor in Bologna. She was...

Maria Gaetana Agnesi (1718-1799), Italian scholar and mathematician. Agnesi was one of 24 children born to a mathematics professor in Bologna. She was...

Anne Sewell Young (1871-1961), US astronomer. Young was one of the few professional women astronomers of her day. She became the director of the Mount...

Anne Sewell Young (1871-1961), US astronomer. Young was one of the few professional women astronomers of her day. She became the director of the Mount...

Anna Botsford Comstock (1854-1930), US naturalist, born Anna Botsford. Botsford was raised on a farm in Otto, New York State, USA. In 1874, she entere...

Anna Botsford Comstock (1854-1930), US naturalist, born Anna Botsford. Botsford was raised on a farm in Otto, New York State, USA. In 1874, she entere...

Lise Meitner (1878-1968), German chemist, in 1916. Meitner was a pioneer of nuclear chemistry. She worked with Otto Hahn (1879-1968) for nearly 30 yea...

Lise Meitner (1878-1968), German chemist, in 1916. Meitner was a pioneer of nuclear chemistry. She worked with Otto Hahn (1879-1968) for nearly 30 yea...

Meitner and Hahn, German chemists, in their Dahlem laboratory, Germany, in 1913. Lise Meitner (left, 1878-1968) and Otto Hahn (1879-1968) worked toget...

Meitner and Hahn, German chemists, in their Dahlem laboratory, Germany, in 1913. Lise Meitner (1878-1968) and Otto Hahn (1879-1968) worked together fo...

Barbara McClintock (1902-1992), American geneticist. Gaining a Ph.D. in botany from Cornell University in 1927, Barbara McClintock went on to make her...

Barbara McClintock (1902-1992), American geneticist. Gaining a Ph.D. in botany from Cornell University in 1927, Barbara McClintock went on to make her...

Charlotte Sitterly, US astronomer. Sitterly (1898-1990) spent most of her life analyzing data from the solar spectrum (the Sun's light split into its...

Charlotte Sitterly, US astronomer. Sitterly (1898-1990) spent most of her life analyzing data from the solar spectrum (the Sun's light split into its...

Charlotte Sitterly, US astronomer. Sitterly (1898-1990) spent most of her life analyzing data from the solar spectrum (the Sun's light split into its...

Charlotte Sitterly, US astronomer. Sitterly (1898-1990) spent most of her life analyzing data from the solar spectrum (the Sun's light split into its...

Gertrude Goldhaber (1911-1998), German/US atomic physicist. She left her native Germany in 1935, and worked at Imperial College, London, UK, until 193...

Gertrude Goldhaber (1911-1998). German/US atomic physicist. She left her native Germany in 1935, and worked at Imperial College, London, UK, until 193...

Physicists Schrodinger, Born, Lonsdale and Ewald with the Irish President Hyde (in wheelchair) and Prime Minister De Valera (far right). Erwin Schrodi...

Physicists Schrodinger, Born, Lonsdale and Ewald with the Irish President Hyde (in wheelchair) and Prime Minister De Valera (far right). Erwin Schrodi...

Ida Noddack. Historical portrait of German chemist Ida Tacke Noddack (1896-1978) around 1930. Noddack was educated in Berlin, Germany, receiving her d...

Ida Noddack. Historical portrait of German chemist Ida Tacke Noddack (1896-1978) around 1930. Noddack was educated in Berlin, Germany, receiving her d...

Maria Goeppert Mayer (1906-1972), German theoretical physicist. Mayer gained her PhD in Germany in 1930. She then moved to the USA with her husband, w...

Marguerite Perey. Historical portrait of the French nuclear chemist Marguerite Perey (1909-75), in 1962. Perey joined Marie Curie's staff at the Radiu...

Marguerite Perey. Historical portrait of the French nuclear chemist Marguerite Perey (1909-75) in 1962. Perey joined Marie Curie's staff at the Radium...