January 20, 2009 Science Source

Gregor Mendel (1822 - 1884), Austrian monk and biologist. Mendel conducted experiments in a monestary in the 1860's with garden peas, working out the...

Benjamin Franklin, inventor, statesman and Founding Father of the United States.

A historical anatomical illustration of the brain with parts labeled according the medical knowledge of the time.

The Battle of the Alamo, March 6th, 1836, in San Antonio, Texas. The battle was part of Mexico's attempt to reclaim the province of Texas from the Uni...

Johannes Kepler, German astronomer (1571-1630). Kepler devised the three fundamental laws of planetary motion. These laws were based on detailed obser...

Johannes Kepler, German astronomer (1571-1630). Kepler devised the three fundamental laws of planetary motion. These laws were based on detailed obser...

David Levy, the world-known comet discoverer and astronomy popularizer, at his home observatory near Tucson, where he discovered most of his comets.

Dr. Mario Motta of Massachusetts, built his new 32-inch robotic telescope with a uniqe Relay optical system. The giant personal observatory, which is...

Brian Marsden, Harvard-Smithsonian Center for Astrophysics' chief astronomer, stands next to the 15-inch Great Refractor, built in the 1840's.

Dr. John Mather, leading astronomer of NASA's Goddard Space Flight Center received Nobel in Physics in 2006. Goddard officials appreciate his success...

Max Planck (1858-1947), German physicist, reading at his desk. Max Karl Ernst Ludwig Planck pioneered the quantum theories that revolutionized classic...

William Harvey (1568-1657), English physician. Harvey was the first person to accurately determine how the heart circulated blood throughout human and...

An illustration depicting William Harvey (April 1, 1578 - June 3, 1657), the medical doctor credited with first describing the properties of the human...

Depicted here are three great teachers of medicine: the Greek physician, Galen (130-200 AD), the Persian physician and philosopher, Avicenna (980-1037...

Democritus of Abdera (470-400 BC), Greek philosopher and the father of atomic theory. Democritus published works on ethics, physics, mathematics, cosm...

Archimedes of Syracuse. (Enhancement of BD5208)

Hipparchus of Rhodes. (Enhancement of BD5199)

A portrait of Claudius Ptolemy. (Enhancement of BD5195)

Alchemy. Historical artwork taken from A very brief tract concerning the Philosophical Stone, Frankfurt, 1678. This title page shows many of the symbo...

Alchemy. Historical artwork, from The Book of Lambspring (1749 edition) of an alchemist roasting a salamander. In alchemy, the salamander signified th...

Medievial alchemy. (Enhancement of 2W3552)

Alchemy. Historical artwork from The Book of Lambspring (1749 edition) of a meeting between a deer and a unicorn in a wood. In alchemy, the deer signi...

Invented by behaviorial psychologist B. F. Skinner to study rats, the box (here, photographed by Sam Falk) was later modified into a baby tender. This...

Revision; Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 1829,...

Neurography; Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 18...

Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 1829, by Jean-B...

Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 1829, by Jean-B...

Myography; Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 1829...

Osteography; Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 18...

Anatomical illustrations representing the circulatory system. 'Angeiographic' from Anatomie methodique, ou Organographie humaine (Systematized anatomy...

Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 1829, by Jean-B...

Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 1829, by Jean-B...

Anatomical illustration from Anatomie methodique, ou Organographie humaine (Systematized anatomy, or human organography), published in 1829, by Jean-B...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the anatomy of the arteries of the human body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the anatomy of the arteries of the human body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...

Illustration from the Anatomy of the Arteries of the Human Body with its applications to pathology and operative surgery. By Richard Quain, Published...