Erik Klemetti

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Sunday Newsletter 

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(Image Credit: Wonderful Nature/Shutterstock) 

white sand under water

Learn more about a sequence of increases in the carbon dioxide in our ancient atmosphere, which can tell us about our oceans’ future.

Ancient Carbon Dioxide Burps Once Devastated Our Oceans, and Could Do So Again

Volcano eruption not associated with the study. (Image Credit: LensFocusArt/Shutterstock)

Stealthy volcano eruption

Slow magma flows, small chambers, and hot rock all contribute to surprise volcano eruptions that occur without any prior warning.

Stealthy Volcanoes Are Quiet Until They Erupt Without Warning Signs – Here's Why

Summer solstice 2025. (Image Credit: Chuta Kooanantkul/Shutterstock)

Summer solstice at Stonehenge

When is the summer solstice? On June 20, 2025, the sun will reach its most northerly point in the sky, marking the start of summer. 

The Peak of the 2025 Summer Solstice Is Coming, Along With Celebrations – Here’s What to Know

Chaitén Volcano in southern Chile erupted on May 2, 2008 for the first time in 9,000 years. NASA satellites that monitor changes in vegetation near volcanoes could aid in earlier eruption warnings. (Image Courtesy of Jeff Schmaltz, MODIS Rapid Response Team, NASA Goddard Space Flight Center)

NASA satellites that monitor changes in vegetation near volcanoes

Learn how the changing color of tree leaves is being used as an early warning sign for volcanic activity.

Trees Can Warn Us of Volcanic Eruptions From Space

(Image Credit: Olga Bogatyrenko/Shutterstock)

Black and white butterfly

Tiny wing scales trapped in fossilized dung suggest butterflies evolved long before flowers appeared.

236-Million-Year-Old Poop Fossil Reveals a Hidden Treasure — Oldest Evidence of Butterflies