powdery mildew

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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

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Various types of sugar. Organic compound. Glucose. Refined sugar, raw sugar, brown sugar, sugar cubes spoon wood

What’s the Difference Between Cane Sugar and Beet Sugar?

Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant

7 of the World’s Deadliest Plants

Monitor. Varanus salvadorii is a monitor lizard found in New Guinea can grows to 2.7 metres (9 ft.) aka Tree crocodile, Crocodile monitor, Salvadori's monitor, artellia, reptile

7 of the World’s Most Dangerous Lizards and Turtles

Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway

Flags That Look Alike

Germans from East and West stand on the Berlin Wall in front of the Brandenburg Gate in the November 10, 1989, photo, one day after the wall opened.

Timeline of the 1980s

U.S. Supreme Court, 1894: Justices Gray, Jackson, Field, Shiras, Harlan, Brewer, White and Chief Justice Fuller.

Why Are There Nine Justices on the U.S. Supreme Court?

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plant disease Dutch elm disease ergot coffee rust late blight chestnut blight Panama disease rust anthracnose leaf blister snow mold

Key People

Robert Almer Harper

Robert Almer Harper

American biologist