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Photo of the antacid Tums

How Do Antacids Work?

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

close up of 3d microscopic blue bacteria

What Was Life Like Before We Knew About Germs?

Hand washing. Healthcare worker washing hands in hospital sink under running water. contagious diseases wash hands, handwashing hygiene, virus, human health

17 Questions About Health and Wellness Answered

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Flags of the countries of the world (flagpoles).

How Many Countries Are There in the World?

"Landing of Columbus" by John Vanderlyn, oil on canvas; commissioned 1836/1837, placed 1847. In the rotunda of the U.S. Capitol, Washington, D.C. 12' x 18' ft. (3.66 m. x 5.49 m.) Christopher Columbus and members of his crew are shown on a beach

5 Unbelievable Facts About Christopher Columbus

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

World Data Locator Map: Australia

Is Australia an Island?

Vietnam War. U.S. President Lyndon B. Johnson awards the Distinguished Service Cross to First Lieutenant Marty A. Hammer, during a visit to military personnel, Cam Ranh Bay, South Vietnam, October 26, 1966. President Johnson

Vietnam War Timeline

A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

Vietnam War. Operation Georgia. U.S. Marines bombing bunkers and tunnels used by the Viet Cong. May 6, 1966

9 Questions About the Vietnam War Answered

lesion: Related Content

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ulcer anatomic lesion biochemical lesion tubercle histologic lesion neurofibromatosis necrosis avascular necrosis gangrene osteonecrosis infarction

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

full human skeleton

Diseases, Disorders, and More: A Medical Quiz

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