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Drilling into Earth’s Mantle
Turns out it was much easier to go to outer space than to inner Earth.In the 1950s, the U.S. and Russia began competitive spaceflight programs. Twenty-five years later, the U.S. Voyager spacecraft…
Orangutan, Heal Thyself
For many thousands of years, humans have used medicinal plants to help heal wounds. It turns out, some of our primate relatives may have, too.In Indonesia, scientists observed a large male orangutan…
How Planets Get Moons
The Moon has inspired humans for countless generations.Among moons, ours is large, about a quarter the size of Earth. But we have only one. Other planets have many. And some have none. Where do they…
Life in Hydrothermal Vents
In the deepest, darkest ocean, caustic, superhot water teems with life.In the rest of the ocean, the food web is built on photosynthesis. Phytoplankton takes in sunlight and carbon dioxide to give…
Earth’s First Geologists
Four to six thousand years ago, humans invented metallurgy. Until that time—for 99 percent of hominid history—we were living in the Stone Age.The earliest evidence of prehumans using stone tools…
Earth’s Billion-Year Mystery
When the first geologists explored the Grand Canyon, they discovered a billion-year mystery that we still haven’t solved.John Wesley Powell, on his 1868 expedition, called the mile-high canyon walls…
The Humongous Fungus Among-Us
Beware, there’s a humongous fungus among us! And if you visit the Malheur National Forest in Oregon, you can walk among it—though you might not know it…Unless you notice that many of the spruce trees…
Living in Lava Tubes
For thousands of years, humans have found shelter in lava tubes. In the future, they may do the same—on the Moon!A lava tube is a cave. It forms when lava flowing in a channel forms a crust on the…
Mother of Landsat
Have you ever seen those beautiful satellite images of Earth and wondered what camera could take them? The answer is no camera could.They’re produced by a multispectral scanner developed in the 1950s…
When Small Organisms Merge
Three times in Earth’s long history, a process called endosymbiosis has occurred. And it has totally changed life on Earth.Two billion years ago, all life was single-celled organisms in an…
Python Protein
How ‘bout a boa burger? Or snake steak?As the world’s population looks for more sources of protein, snakes in the constrictor family may be the perfect choice.That’s because, over millions of years,…
Healing the Ozone Hole
Ozone makes up a tiny portion of Earth’s atmosphere, but it allows for life on Earth.The oxygen we breathe is what’s called molecular oxygen, O2—two atoms of oxygen bonded together. High above…
Solar Flares vs Coronal Mass Ejections
Solar flares and coronal mass ejections are the most powerful explosions in our solar system—too large, heavy and fast-moving to imagine. But they’re not the same thing.They occur mostly when the…
Dino Diseases
Dinosaurs, like most large animals today, had long lives. Therapods like T. rex lived to about 30 years, while giant sauropods could live to 60.And over those long lifespans, like all of us, they got…
The Changing Tides
It may appear that tides come in and out. But that’s not really what happens.In fact, the Moon pulls the ocean toward it, creating what’s called a “tidal bulge” of higher water surface.The tidal…
Opposable Thumbs Up!
Many evolutionary advances, like big brains, have given humans an advantage over other animals. Perhaps one of the least appreciated is the thumb.Specifically, the opposable thumb--meaning opposite…
Super Harvest Bloody Moon
On September 17, 2024 we’ll have a Super Harvest Bloody Moon.Kind of a fantastical, creepy name, but those three adjectives each describe a different celestial event, which will coincide in this one…
The First Dinosaur Fossil
The first dinosaur fossil documented by a scientist was 350 years ago, in 1677.It was part of a femur discovered in a shale mine in England, then sent to a local museum. The curator had never seen…
Shark Planet
Sharks have been so successful, for so much longer than so many other lifeforms, that you could call Earth the shark planet.They evolved over 400 million years ago, meaning they’re older than trees.…
More Auroras
Every 11 years, the Sun cycles from solar minimum to solar maximum, as we discussed in a prior EarthDate. And we’ve just entered another solar maximum, where the Sun emits many more charged particles…
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EarthDate has published 300 episodes since February 2026, covering topics in Earth Sciences, Education.
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