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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.

30/09/2025

Sulfur is the stinky troublemaker behind rotten eggs and volcanic fumes. From the proteins in your body to the fertilizers that grow food, sulfur is everywhere whether you smell it or not! Today's EarthDate episode takes a whiff of smelly sulfur: https://www.earthdate.org/episodes/sulfur-stinks

26/09/2025

Recent unmanned Moon missions have confirmed the existence of ice, as well as rusty iron oxides, near the lunar poles. With its thin atmosphere, water on the Moon’s surface should evaporate and be lost to the vacuum of space. Yet evidence of water persists. Scientists believe that most of the time, hydrogen ions needed for lunar water are provided by the solar wind. But for about 25% of the lunar cycle, when Earth shields the Moon from the solar wind around the time of the full moon, it is Earth wind, from Earth’s magnetotail, that bathes the Moon in ions like hydrogen that react with oxygen in lunar rocks to replenish lunar hydroxyl (-OH) and water (H2O). Learn more here: https://www.earthdate.org/episodes/earth-wind-and-water

Photo credit: E. Masongsong, UCLA EPSS, NASA GSFC SVS.

23/09/2025

Rabies can infect all warm-blooded animals, including humans. Without treatment, it almost always results in death. Louis Pasteur’s work on germ theory led to the life-saving vaccine. Today's EarthDate episode follows his journey to a cure: https://www.earthdate.org/episodes/pasteurs-rabies-vaccine

19/09/2025

As he was exploring the southern coast of Australia in 1802, Mathew Flinders scrambled to the high point of an island and observed a baffling otherworldly sight: a bright pink lake. The lake is as salty as the Dead Sea, but what makes it flamingo pink? Hypersaline bacteria and algae that protect themselves from ultraviolet light (UV) damage using beta-carotene. They are the same organisms that color the brine shrimp that flamingos dine upon that end up coloring the feathers of the flamingos. These organisms thrive in salty lakes and commercial salt evaporation ponds, resulting in a range of vivid colors. Today's EarthDate episode explains this colorful phenomenon. Listen here: https://www.earthdate.org/episodes/flamingo-pink-lakes

16/09/2025

China’s Chang’e lunar missions push the boundaries of space exploration, from landing on the Moon’s far side to returning samples that reshaped our understanding of lunar history. Today's EarthDate hitches a ride on the Chang’e missions. Listen here: https://www.earthdate.org/episodes/chinese-moon-missions

11/09/2025

There is a delicate oxygen balance mediated by the interplay of oxygen-producing photosynthesis and oxygen-consuming fire that made Earth habitable for large terrestrial animals. But researchers believe that fire also played a remarkable role in the evolution of hominids and humans. The leap that enabled our ancestors to control fire may be one of our most important technological advances. Cooked food is easier to digest, providing extra protein that supported increased brain growth critical to human development. Cooked food also takes less time to chew, freeing up time for other pursuits. Today's EarthDate discusses this fiery balance. Hear it at: https://www.earthdate.org/episodes/man-made-fire-fire-made-man

09/09/2025

Tardigrades, also called water bears, are microscopic organisms found in diverse habitats known for their extraordinary ability to survive extreme conditions. Today's EarthDate episode meets these tough little critters. Listen here: https://www.earthdate.org/episodes/indestructible-water-bears

05/09/2025

Fire is a chemical reaction that requires an ignition source, fuel and oxygen, producing heat, light, ash and smoke. For billions of years, there was no fire on Earth—even with an effective ignition source like lightning, fire could not happen until there was enough fuel and oxygen to sustain the reaction. But once land plants evolved to use photosynthesis to turn carbon dioxide into oxygen, wildfire became possible, turning that oxygen back into carbon dioxide. These two chemical reactions have balanced the level of oxygen in Earth’s atmosphere for more than 300 million years, sustaining terrestrial life—like us. Today's EarthDate episode explains this balancing act over millennia. Listen here: https://www.earthdate.org/episodes/flammable-planet

02/09/2025

In 1925, Werner Heisenberg helped launch the field of quantum mechanics, revealing the strange and unpredictable nature of the atomic world. Today's EarthDate examines the impact his work has had on science. Listen here: https://www.earthdate.org/episodes/in-two-places-at-once

29/08/2025

We usually think that light and heat go together, but “cold light” is generated in some situations that do not involve heat. Certain materials will light up when crushed, not because they are creating sparks, but because of microscopic-scale lightning that occurs as electrical charges separate then interact with nitrogen in air. You can get a good laugh out of demonstrating this effect with rocks, tape and even sugar candies. Materials scientists use it to provide warnings before potential catastrophic failures occur in high-value structures like bridges and spacecraft. Today's EarthDate episode sparks a conversation about "cold" lightning. Hear it at: https://www.earthdate.org/episodes/cold-lightning

26/08/2025

Trees breathe by taking in carbon dioxide and releasing oxygen. Ponderosa pine trees can halt this process when exposed to wildfire smoke, protecting themselves but at a cost to growth. Today's EarthDate episode explores how trees breathe. Listen here: https://www.earthdate.org/episodes/trees-hold-their-breath

19/08/2025

Broadcast radio celebrated its 105th anniversary in 2025. Although many other forms of media are now in use, radio serves as the foundation for global communication. Today's EarthDate episode recounts the history of radio. Tune in here: https://www.earthdate.org/episodes/history-of-radio

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