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Sergio Cereceda Stone (1942- )
By: Hilary Gilson
| Published: Jun 07, 2010
Sergio Cereceda Stone was born 16 April 1942 in the coastal city of Valparaiso, Chile. Stone's mother Luz was a housewife and caretaker for Sergio…
PeopleFertilityethicsReproductionBiography
The Galton Society for the Study of the Origin and Evolution of Man (1918–1935)
By: Aliya R. Hoff
| Published: Jun 03, 2021
Charles Benedict Davenport, Madison Grant, and Henry Fairfield Osborn founded the Galton Society for the Study of the Origin and Evolution of Man, or…
OrganizationEugenicsDavenport, Charles Benedict, 1866-1944Laughlin, Harry Hamilton, 1880-1943segregation
Thesis: The ‘History and Nature of Science’ in the Era of Standards-Based Reform
By: Cera Lawrence
| Published: Dec 09, 2020
The goal of science education in the United States is promoting scientific literacy for all students. The goal necessitates understanding the nature…
literacyEducationGeneral EducationReadingWriting
“A Proposed Structure for the Nucleic Acids” (1953) by Linus Pauling and Robert Brainard Corey
By: Victoria Hernandez
| Published: Aug 26, 2019
In February 1953, Linus Pauling and Robert Brainard Corey, two scientists working at the California Institute of Technology in Pasadena, California,…
LiteratureDNAGeneticsX-ray crystallography--TechniqueCrystallography, X-Ray
Equilibrium Density Gradient Centrifugation in Cesium Chloride Solutions Developed by Matthew Meselson and Franklin Stahl
By: Victoria Hernandez
| Published: Dec 19, 2017
Matthew Meselson, Franklin Stahl, and Jerome Vinograd, developed cesium chloride, or CsCl, density gradient centrifugation in the 1950s at the…
TechnologyDNA ReplicationDNA replication--RegulationCentrifugation, Density GradientOrganonitrogen compounds
HIP Randomized Breast Cancer Screening Trial (1963–1982)
By: Dina A. Lienhard
| Published: Aug 08, 2017
From 1963 to 1982, researchers in New York City, New York, carried out a randomized trial of mammography screening. Mammography is the use of X-ray…
ExperimentsHIPMammographyBreastcarcinoma
Interspecies SCNT-derived Humanesque Blastocysts
By: Sarah Taddeo, Jason S. Robert, Nicole Diehnelt
| Published: Jun 23, 2017
Since the 1950s, scientists have developed interspecies blastocysts in laboratory settings, but not until the 1990s did proposals emerge to engineer…
BlastocystDiseasesbioethicsTadpoleCell nuclei--Transplantation
William Smellie (1697–1763)
By: Yvette Tran
| Published: May 30, 2017
William Smellie helped to incorporate scientific medicine into the process of childbirth in eighteenth century Britain. As a male physician…
MidwivesObstetrical ForcepsChildbirthObstetricsLabor (Obstetrics)
The Meselson-Stahl Experiment (1957–1958), by Matthew Meselson and Franklin Stahl
By: Victoria Hernandez
| Published: Apr 18, 2017
In an experiment later named for them, Matthew Stanley Meselson and Franklin William Stahl in the US demonstrated during the 1950s the semi-…
DNA ReplicationMeselson, MatthewStahl, Franklin W.DNA--SynthesisDNA
Beadle and Ephrussi Show that Something Besides Eye Tissue Determines Eye Color in Fruit Flies
By: Amy Pribadi
| Published: Oct 11, 2016
In the 1930s, George Beadle and Boris Ephrussi discovered factors that affect eye colors in developing fruit flies.
Fruit-fliesImaginal DisksGeneticsdevelopmentMetamorphosis, Biological