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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

Discover

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?

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

Casino. Gambling. Slots. Slot machine. Luck. Rich. Neon. Hit the Jackpot neon sign lights up casino window.

Brain Games: 8 Philosophical Puzzles and Paradoxes

Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.

9 of the World’s Deadliest Mammals

bat flying

Are Bats Really Blind?

Thanksgiving Turkey with all the sides

Why Do We Eat Turkey on Thanksgiving?

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

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Topics

wildfire plant disease curly top psorosis wilt rot Dutch elm disease rice bacterial blight late blight fire blight rust Panama disease

Key People

Dmitry Ivanovsky

Russian microbiologist