Tag: embryo
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A brief history of menstruation
Fangzhou LuoPortland, Oregon, United States After a few failed attempts to redirect a flirtatious student to “higher pleasures” like music, the Ancient Greek philosopher and mathematician Hypatia resorted to revealing where she was in her menstrual cycle to deter him. The philosopher who recorded this—Damascius—does not specify if this student was Orestes,1 who remained a…
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Twins
John Graham-Pole Clydesdale, Nova Scotia, Canada Artwork by Susan Napier. Published with permission. Why was she taken? While you remain to question me for your school project? Renee had a project. Her seventh-grade class had been set the task of composing an essay on some aspect of American society. She had settled on tackling…
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Cells of an embryo
The layers of cells in an embryo, also known as germ layers, develop in stages to create all the parts of the living body. This image from 1874 illustrates exactly that. Showing the differing shapes of differing embryos, but matching the colors of each system across them, creates an effective tool. For example, the yellow…