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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.

07/02/2025

You may have heard of your microbiome, but did you know you also have your very own virome? There are trillions of viruses in the human body. They live in us, but they aren’t actually “alive.” A tiny fraction are harmful parasites, while the rest are benign symbionts. Some are helpful protectors while others are just hitchhiking. How do viruses work, anyway? Today's EarthDate episode scrubs up to examine the human virome. You can hear it at: https://www.earthdate.org/episodes/your-friendly-virome

04/02/2025

With 98% of its surface covered by ice, geological detectives use outcrops, aerial and satellite-based remote sensing, and geological plate reconstructions to understand Antarctic's topography. Today's EarthDate episode peers under its ice. Listen here: https://www.earthdate.org/episodes/extreme-antarctica

31/01/2025

The primitive immune systems of horseshoe crabs have effectively protected them through the eons, and a unique extract derived from their blue blood also protects humans from potentially fatal toxins. That substance is essential for the testing of any medical material that comes in contact with our bloodstream, including vaccines, IVs, and implants. Today's EarthDate episode shares the story of how these ancient critters provide vital assistance to human health. Learn more about it here: https://www.earthdate.org/episodes/blue-blooded-horseshoe-crabs

28/01/2025

After the demise of the dinosaurs, mammals grew larger to occupy the former niches of dinosaurs. But, as continental glaciers retreated, 178 species of giant mammals became extinct. Today's EarthDate episode ponders why they disappeared. Listen here: https://www.earthdate.org/episodes/where-did-the-giant-mammals-go

24/01/2025

Most living things adapt over time, but horseshoe crabs found their perfect form more than 400 million years ago and haven’t needed to evolve much ever since. They are long-lived marine scavengers with a highly effective, yet primitive, immune system that has protected them through the eons. Today's EarthDate episode tips its hat to these living fossils. You can hear it at: https://www.earthdate.org/episodes/horseshoe-crabs-living-fossils

21/01/2025

Egyptian pyramids were constructed over 3,500 years ago, but there are no records of how they were built. Radar sensing has located vestiges of a Nile River branch that may have been instrumental in building them. Today's EarthDate uncovers the ancient Nile. Listen here: https://www.earthdate.org/episodes/mystery-of-the-pyramids-solved

15/01/2025

Some animals freeze solid over winter, then miraculously come back to life in the spring. Their secret is sugars in their cells that act like antifreeze. Today's EarthDate episode shares the cold hard facts about these amazing creatures. Listen here: https://www.earthdate.org/episodes/frogsicles

09/01/2025

Snowflakes capture our imagination with their fleeting beauty and uniqueness. They are crystals of ice that form when water v***r in air freezes directly into ice, organizing itself into familiar intricate hexagonal designs. Snow crystals take many interesting forms that depend on the conditions in the cloud where they form. Today's EarthDate episode admires these beautiful winter marvels. Please listen to it here: https://www.earthdate.org/episodes/how-snowflakes-grow

07/01/2025

The Earth’s solitary moon has influenced our planet for billions of years. How are moons of the planets in our solar system distributed, and how do planets capture and keep their moons? Today's EarthDate episode helps to answer that question. Listen here: https://www.earthdate.org/episodes/how-planets-get-moons

03/01/2025

The Earth’s year is defined by its annual voyage around the Sun. For part of the year, the Earth is closer to the Sun, and for part of the year, it is farther from the Sun. But if you live in the Northern Hemisphere, you might be surprised to learn that in the winter, The Earth is 3 million miles (5 million km) closer to the Sun than in summer! This is called the perihelion. Today's EarthDate episode observes this annual phenomenon. Learn more about it here: https://www.earthdate.org/episodes/winter-sun-close-encounter

31/12/2024

In late 2000, scientists exploring the mid-Atlantic Rift found hydrothermal vents called "black smokers". Surprisingly, these hosted a unique community of extremophiles. Today's EarthDate dives deep to research these strange creatures. Listen here: https://www.earthdate.org/episodes/life-in-hydrothermal-vents

27/12/2024

What is a second? Time can be measured from the coarse scale or the fine scale. The coarse-scale approach starts with the length of a day and divides it up into 86,400 seconds. The fine-scale approach starts with a very consistent measurement of the frequency required to cause energy level transitions in certain atoms. For cesium-133, this frequency is more than 9 trillion cycles per second. How do we measure the second today? Today's EarthDate episode takes a little time to answer that question. Hear it at: https://www.earthdate.org/episodes/just-a-second

24/12/2024

The Cold War race between the U.S. and the U.S.S.R. to drill into Earth's mantle proved to be too difficult an engineering challenge. But last year, the International Ocean Discovery Program finally made it. Today's EarthDate episode tells the story here: https://www.earthdate.org/episodes/drilling-into-earths-mantle

21/12/2024

Humans have both English and metric systems of measurement for just about everything else, but, thankfully, it is universally agreed upon that a day has 24 hours, an hour has 60 minutes, and a minute has 60 seconds. With our 10 fingers and 10 toes, we tend to operate in the base-10 world, so why are hours organized in multiples of 12 and minutes and seconds divided into 60? Today's EarthDate,episode takes just a second to answer that question. Listen to it at: https://www.earthdate.org/episodes/how-10-fingers-became-12-hours

17/12/2024

Recently, researchers observed Rakus, a male Sumatran orangutan, tend to a deep wound on his face with a medicinal plant. The wound closed in five days and healed in less than six weeks. Today's EarthDate episode describes how many animals treat themselves with medicinal plants. Hear it at: https://www.earthdate.org/episodes/orangutan-heal-thyself

13/12/2024

The great waterfalls of the world are wondrous sights, each unique in its own way. Several stand out by virtue of their sheer magnitude of width, average flow volume, and height. But you can’t view Earth’s tallest and most powerful waterfall without a submarine—it’s found underwater between Greenland and Iceland in the Denmark Strait. Today's EarthDate episode looks at the world's amazing waterfalls. Listen to it at: https://www.earthdate.org/episodes/wondrous-waterfalls

10/12/2024

Prehistoric tool makers became Earth’s first geologists, searching for just the right raw materials. Today's EarthDate episode recounts the vital relationship between the rocks that they made into stone tools and ancient hominids. Listen in at: https://www.earthdate.org/episodes/earths-first-geologists

06/12/2024

Three-quarters of Greenland is covered by a permanent ice sheet that is up to 2 miles thick. In Operation IceBridge, scientists used ice penetrating radar to see what is hiding beneath Greenland’s ice, imaging multiple layers of ice, deep canyons, and a probable impact crater. Today's EarthDate episode learns about what Operation IceBridge discovered. Hear it at: https://www.earthdate.org/episodes/under-greenlands-ice-sheet

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