Science

Grand Canyon National Park via AP

A rock tumble at the Grand Canyon revealed fossil footprints that researchers say are among the oldest in the park.

Sandra Pascoe Ortiz

Fans of the prickly pear cactus might be familiar with recipes for cactus jelly, cactus candy, and fried cactus pads or nopalitos. But how about a recipe for a biodegradable plastic bag?


Earth Notes: Leslie Goodding

Sep 25, 2019
Aven Nelson Papers, American Heritage Center, University of Wyoming

In May 1902 a young man with a black beard and tousled hair stood beside the Muddy River in a place later submerged by the waters of Lake Mead. Leslie Goodding inspected an unusual willow tree there—shrubby with long, slender branches and festooned with dangling, pale-yellow catkins. He cut a few sprigs from the tree and clamped them into his wooden plant press.  

Derek Storm, www.derekstorm.com

NASA has wrapped up the first phase of a study on the long-term effects of space travel by using twins as research subjects. Scientists wanted to study people with the same genetics to compare DNA changes in different environments. There was really only one set of twins that would work for this particular study: astronaut brothers Mark and Scott Kelly. Scott spent 342 days in space – setting a new record – and Mark stayed on Earth, acting as a control experiment. On a recent stop in Flagstaff, Mark Kelly spoke with KNAU’s Zac Ziegler about the experience and what NASA has learned so far.


Earth Notes: Upheaval Dome

Apr 17, 2019
Doc Searls, CC, Wikimedia

The unusual shape of a noted geologic feature in Utah’s Canyonlands National Park becomes fully clear only from the air. From a small plane, Upheaval Dome seems to have collapsed.


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