Happy birthday to Francis Collins, born April 14, 1950! He led the Human Genome Project, which mapped and identified the functions of the genes of the human genome. He also discovered genes associated with several diseases.
Multitalented Dutch scientist Christiaan Huygens was born April 14, 1649. He is considered the first theoretical physicist; he derived the formulae for centripetal and centrifugal force; identified the laws of elastic collision; developed a wave theory of light; invented the pendulum clock; made improvements to the telescope; discovered Saturn's moon Titan and also the rings of Saturn.
Born April 15, 1772, Étienne Geoffroy Saint-Hilaire was a French naturalist who theorized an underlying unity of organismal design, and the possibility of species transmutation in time. Developing on the ideas of his colleague Jean-Baptiste Lamarck, Saint-Hilaire gathered evidence in embryology, amassing evidence for his claims through research in comparative anatomy, and paleontology. His ideas anticipated the evo-devo evolutionary concept.
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