ptilinum

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King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

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?

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

Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

ptilinum

insect anatomy

Learn about this topic in these articles:

function in houseflies

In housefly
…developed, expand a pouch (ptilinum) on the head and break off the end of the puparium to emerge.
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