David Johnston

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Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

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?

Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

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

7 of the World’s Deadliest Plants

US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.

Timeline of the 2000s

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

David Johnston

Canadian government official

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Jean

In Michaëlle Jean
…governor-general and was succeeded by David Johnston.
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