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May 21, 2022 9:00 AM
Steelmaking is a major source of emissions. These companies are racing to fix it.
May 20, 2022 6:00 PM
Featured in lava tubes
May 27, 2021
These astronauts are preparing for life on Mars by living in Hawaiian lava tubes
The caves are an excellent facsimile of lava tubes on other planets.
Oct 23, 2009
Newly Discovered Network of Moon Tunnels Could House Lunar Colonists
The moon may be a harsh mistress, but lately she has been giving up her secrets. Scientists have spotted a...
Sep 27, 2006
What Would You Do With Your Mountain Fortress?
Hollowed-out mountains are good for so many things. They can house strategic military bases. They can store toxic waste. And...
Apr 17, 2002
How Did the Spouting Horn on Kauai Come to Exist?
The spouting horn is a remnant of activity that has occurred intermittently between 500,000 and 3.6 million years ago.