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You are looking at eye tissue as seen through a transmission electron microscope. This image was taken by James Duncan Davidson, who made it by holding an iPhone up to the microscope's eyepiece. Davidson took the picture at the Moran Eye Center.
The Pfizer and Moderna COVID-19 vaccines are the first to use the RNA coding molecule to prompt our bodies to fight the virus. Here's how they work.
A Stanford dermatologist weighs in on using retinol to fight aging, acne and other skin problems, and whether it deserves the hype.