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People wearing surgical masks (also called face mask or medical masks or safety masks) walk through the city center of Milan, Italy on Feb. 23, 2020. Coronavirus disease COVID-19 pandemic

How Do Face Masks Control the Spread of Disease?

Scanning electron micrograph showing the spiral-shaped bacteria of the genus Leptospira. These organisms cause leptospirosis.

8 Zoonotic Diseases

Scan of human brain

What Are the Symptoms of a Stroke?

close up of 3d microscopic blue bacteria

What Was Life Like Before We Knew About Germs?

H1N1 influenza virus particles. Colorized transmission electron micrograph. Surface proteins on surface of the virus particles shown in black. Influenza flu

10 Ways of Looking at Cells

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Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

Paul Revere. "The bloody massacre perpetrated in King Street Boston on March 5th 1770 by a party of the 29th Regt.," engraved by Paul Revere. Boston Massacre.

There’s a Riot Goin’ On: Riots in U.S. History (Part One)

Time zone map with standard time zones and International Date Line

Why Are Some Time Zones 30 Minutes Off Instead of an Hour?

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

Artist interpretation of space asteroids impacting earth and moon. Meteoroids, meteor impact, end of the world, danger, destruction, dinosaur extinct, Judgement Day, Doomsday Predictions, comet

Major Mass Extinctions

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

Statue of Nostradamus

Nostradamus and His Prophecies

fistula: Related Content

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Topics

oro-antral fistula obstetric fistula human disease metabolic disease atrophy lupus erythematosus tumour hypoxia malnutrition progeria hernia ulcer dwarfism

Quiz

44 Questions from Britannica’s Most Popular Health and Medicine Quizzes

full human skeleton

Diseases, Disorders, and More: A Medical Quiz

A Yorkshire terrier dressed up as a veterinarian or doctor on a white background. (dogs)

A Visit with the Word Doctor: Medical Vocabulary Quiz