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EarthDate is a weekly podcast providing a fun and informative interlude for listeners which focuses on the workings and complexity of our planet – its geology, its environment, and its major geologic events, both distant and more recent.

27/06/2024

In the 1960s, Ohio’s Cuyahoga River was considered the most polluted river in the country, completely barren of life along the 38 miles between Akron and Cleveland. Oil slicks on the river caught fire more than a dozen times from 1868 to 1969, but it was the fairly small blaze on June 22, 1969, that sparked a national movement to clean up polluted waterways, resulting in the Clean Water Act, Earth Day, and the U.S. Environmental Protection Agency. Learn more in this episode at: https://www.earthdate.org/episodes/the-burning-river

14/06/2024

Today the speed and accuracy of GPS has resulted in new and unexpected applications, from tracking shopping carts for a better understanding of shopper habits, to improving early warning systems for several types of natural disasters. Today's EarthDate episode is guided by the technical wizardry of GPS. Listen to it here: https://www.earthdate.org/episodes/maximizing-gps

11/06/2024

Big Bend National Park, with its rich human history and remarkable natural gifts, is a vast land of dramatic contrasts. It was dedicated as a national park 80 years ago this week. Today's EarthDate episode wishes the park a Happy Birthday! Here it at: https://www.earthdate.org/episodes/big-bend-national-park-is-80

06/06/2024

White is the presence of all the colors of the visible spectrum, and black is the absence of colors from the visible spectrum. White and black are actually not colors, they are visual experiences. Both nature and man have developed ways to make black even blacker for a variety of reasons. Today's EarthDate episode describes "ultra-black". You can hear it at: https://www.earthdate.org/episodes/ultra-black

04/06/2024

The “Big Bend” in the Rio Grande that forms the iconic shape of Texas is located at the intersection of a number of geologic events that occurred over millions of years. Today's EarthDate episode explores the incredible geology of Big Bend. Listen here: https://www.earthdate.org/episodes/rio-grandes-big-bend

31/05/2024

For 80,000 years, a giant has lived in the Fishlake National Forest of southern Utah. Pando, the “Trembling Giant”, is a clonal colony of quaking aspen with more than 47,000 trunks, making it the heaviest living organism on Earth—as well as one of the oldest. Today's EarthDate episode stretches out under the many branches of Pando. You can hear it at: https://www.earthdate.org/episodes/pando-a-forest-of-one

29/05/2024

The accomplished submarine Alvin was commissioned 60 years ago. Today, it is the U.S. Navy’s only deep-submergence vehicle that can carry researchers to the seafloor, as deep as 21,300 ft. Today's EarthDate episode dives with Alvin. Here it at: https://www.earthdate.org/episodes/the-longest-deepest-diver

21/05/2024

Lightweight, corrosion-resistant aluminum is one of the world’s most useful metals. Producing it requires a lot of processing, but it is easily recycled. Today's EarthDate episode pops a top in a tribute to aluminum. Listen here: https://www.earthdate.org/episodes/ideal-material

14/05/2024

For the first time since 1803, two "broods" of cicadas will emerge from underground at the same time in 2024, making for a very noisy year. Today's EarthDate episode is serenaded by this crescendo of buzzing choruses: https://www.earthdate.org/episodes/cicada-cacophony

09/05/2024

Researchers appear to have underestimated the hunting prowess of prehistoric humans, assuming they could only hunt the huge megafauna of the Pleistocene if the animals were already compromised or injured. But recent finds show that as many as 14,700 years ago, hunter-gatherer bands of humans deliberately trapped woolly mammoths in hand-dug pits and may have used the same pits repeatedly for more than 500 years. Today's EarthDate episode hunts with our ancestors. Hear it at: https://www.earthdate.org/episodes/mammoth-traps

07/05/2024

What if Earth’s natural satellite, our Moon, wasn’t out there? What would change, and what would that mean for us? Today's EarthDate episode goes through what losing our Moon would mean to our planet and to life on Earth. You can hear it at: https://www.earthdate.org/episodes/if-earth-had-no-moon

01/05/2024

In 1933, in the Sahara Desert in southwestern Egypt, László Almásy discovered rock art depicting human figures that appear to be swimming. Today's EarthDate episode explains how the Sahara had lakes and was periodically lush and green. Listen to it at: https://www.earthdate.org/episodes/swimming-in-the-sahara

23/04/2024

More than 500 years ago, Leonardo da Vinci formulated his “rule of trees” to help him more perfectly depict nature. Since then, artists have used this rule to add realism to their work. Today's EarthDate episode examines Leonardo's rule. Hear it at: https://www.earthdate.org/episodes/leonardos-rule-of-trees

16/04/2024

Italy’s third-largest city, Naples, is known for its close proximity to Mount Vesuvius. More than 3.6 million Italians in the Naples metropolitan area coexist with volcanism. Today's EarthDate episode wonders why they stay in this potentially deadly area. Listen to it here: https://www.earthdate.org/episodes/life-in-the-fiery-fields

09/04/2024

Stegosaurus is one the most recognizable dinosaurs, with vertical plates on its back and a spiky tail. Its unique plates are a curiosity that scientists have been trying to figure out for decades. Today's EarthDate episode has some theories. Check it out: https://www.earthdate.org/episodes/stylish-stegosaurus

03/04/2024

Solar weather forecasts shift every 11 years, and the next "solar maximum" is coming on stronger than expected -- it could actually endanger critical infrastructure. Today's EarthDate episode heats up with the next solar maximum. Listen to it here: https://www.earthdate.org/episodes/solar-maximum-is-heating-up

29/03/2024

Monarch butterflies travel up to 3,000 mi (4,800 km) during their migrations, and the butterflies that return to the same trees each winter are the great-great grandchildren of the butterflies that rested there a year earlier. Some populations winter in California, some in Mexico, and some just stay year-round in Florida. Today's EarthDate episode travels with the Monarchs. You can listen to it here: https://www.earthdate.org/episodes/the-amazing-monarch-relay

27/03/2024

A once-secret project below a U.S. military base in Greenland was scuttled in the 1960s because of unstable ice. However, the ice core from the venture led to scientific discovery. Today's EarthDate episode learns from this abandoned project. Listen here: https://www.earthdate.org/episodes/secrets-under-ice

22/03/2024

Earth’s natural heat is the source of geothermal energy, and it is most accessible where melted rock comes close to the surface near volcanoes. With 30 active volcanic systems, Iceland is known as “the land of fire and ice” and has pioneered the use of geothermal energy for more than a century. Recent experiments are taking that leadership a step further with deep drilling to reach supercritical geothermal reservoirs that may produce 10 times the power of traditional geothermal wells. Today's EarthDate episode heats up with geothermal energy. Hear it at: https://www.earthdate.org/episodes/iceland-the-geothermal-pioneer

19/03/2024

375 million years ago, the tetrapods emerged from the sea. Today, mudskippers are fish that are leaving the water, shedding light on how tetrapods may have made their evolutionary leap. Today's EarthDate episode evolves with the mudskippers. Listen here: https://www.earthdate.org/episodes/fish-out-of-water

12/03/2024

The universal constant pi (π) might just be our most important number. It is a fundamental characteristic of every sphere, circle or arc. It’s so important it has its own holiday, March 14 or 3-14. Today's EarthDate honors this vital number. Listen here: https://www.earthdate.org/episodes/pi-p-is-everywhere

08/03/2024

In the 1840s and 1850s, California was exceptionally dry, so by the fall of 1861, California ranchers were hoping for rain. In late November they got what they were wishing for—and then some. It didn’t stop raining for 43 days, and by January 1862, the Central Valley was filled with an inland sea. It was the largest flood in the recorded history of California. Huge storms like these are now known as atmospheric rivers. Atmospheric rivers strike the U.S. West Coast several times a year on average. Today's EarthDate episode remembers California's "Super Flood". Listen here: https://www.earthdate.org/episodes/californias-super-flood

05/03/2024

On April 8, 2024, an eclipse will cross the United States from Texas to Maine. It has been seven years since the U.S.'s last solar eclipse in 2017. Today's EarthDate episode dons protective glasses to look at the "Great American Eclipse of 2024". Listen here: https://www.earthdate.org/episodes/great-american-eclipse-ii-april-8-2024

29/02/2024

Salt has played a major role in most of human history, providing food security for populations by preserving food for times when fresh food was not available. However, using it requires a delicate balance because too much salt can kill us—or preserve us in some ancient cases from Egypt, Austria and Iran. Today's EarthDate episode is seasoned with salt. Listen here: https://www.earthdate.org/episodes/preserving-with-salt

27/02/2024

A recent study demonstrates that some red algaes are actually “pollinated” by crustaceans, as are seagrasses. Today's EarthDate episode dives deep to observe these "Bees of the Seas". You can hear it at: https://www.earthdate.org/episodes/bees-of-the-seas

23/02/2024

In August, 2019, several groups of sailors were surprised to find themselves sailing through rocks as far as the eye could see. It was pumice that had been extruded from a subsea volcanic vent near Tonga and had accumulated into a raft the size of Manhattan. The raft was headed toward the Great Barrier Reef carrying organisms that may have brought new life to the reef. Some scientists suggest that rafts such as this one were instrumental in the distribution of life-forms around the planet. Today's EarthDate episode examines these floating rocks. You can hear it at: https://www.earthdate.org/episodes/floating-rocks

20/02/2024

Moving groundwater can cause erosion underground, especially in soluble bedrocks. Underground voids may gradually develop into sinkholes if their roofs collapse, costing millions of dollars in property damage annually. Today's EarthDate episode peers into these natural hazards. Listen here: https://www.earthdate.org/episodes/sinkholes

15/02/2024

Pangolins are insectivores that may look like anteaters or armadillos, but they are more closely related to dogs or bears. They are Earth’s only scale-covered mammals. Their meat is considered a delicacy and their fingernail-like scales are used in Thai, Chinese and Vietnamese folk medicine. There are eight species of pangolins. These gentle, shy creatures are the world’s most trafficked animals. Today's EarthDate episode introduces you to these fascinating creatures. You can listen here: https://www.earthdate.org/episodes/plight-of-the-pangolin

13/02/2024

Years ago, paleontologists reasoned that Tyrannosaurus Rex had jaws with exposed teeth similar to crocodiles. But recently, scientists have given the teeth of these dinosaurs a second look. Today's EarthDate episode explains what they found. Listen here: https://www.earthdate.org/episodes/delicate-t-rex-smile

09/02/2024

Tons of pebble-sized and smaller meteors disintegrate in Earth’s atmosphere every day, while much-rarer huge asteroid impacts that may liquefy Earth’s surface and change the trajectory of life strike every few million years. But what happens when mid-sized objects smash into the planet? In 2013 and 1908, we witnessed dramatic airbursts over southern Russia, and researchers have found evidence of a similar event that wiped out thriving Middle Eastern communities 3,700 years ago. Today's EarthDate episode watches the skies for these meteors. You can hear it at: https://www.earthdate.org/episodes/airbursts

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