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How and when did the first living creatures crawl up onto land and what were the first terrestrial animals like? This radio broadcast tracks down the little arthropods, whose trackways have been discovered in the ancient sandstones of Ontario in Canada; these trackways date back 500 million years and offer the earliest evidence so far of animals coming onto land for the first time. These creatures ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Biology, Paleontology
 
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This radio broadcast explores one of the greatest challenges facing astronomers today - how do galaxies form? Astronomers are now piecing together the story of the formation of our Milky Way by observing other galaxies at different epochs of the universe. The broadcast reports on the DEEP Project (Deep Extragalactic Evolutionary Probe); the bottom up theory of galaxy formation, which holds that galaxies ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Space science
 
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Deep beneath the surface of Earth lies one of the most destructive and yet least understood of the natural forces on the planet: the super volcano. This radio broadcast presents discussions with scientists at Yellowstone National Park who are investigating this potentially devastating natural phenomenon. Yellowstone National Park is one of the largest supervolcanoes in the world. It last erupted 640,000 ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Geology, Natural hazards
 
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This radio broadcast reports on the Sudbury Neutrino Observatory (SNO), located 2 kilometers underground. SNO has been detecting neutrinos that are released during solar thermonuclear reactions. Neutrinos come in three flavors: electron, muon, and tau neutrinos. The neutrinos generated by the Sun are all electron neutrinos, but the amount of these neutrinos observed on Earth had fallen short of what ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Space science, Technology
 
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This radio broadcast looks at the mysterious way in which certain animals can travel vast distances around the planet, using the magnetic field of Earth to guide them. Migrating birds, fish, sea turtles, honey bees and even bacteria have all been found to navigate using the magnetic field of Earth, sometimes over quite enormous distances and reaching targets of only a few degrees in width. There is ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Biology, Geophysics
 
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This broadcast reports on Gravity Probe B, a satellite designed to test the frame dragging prediction of Einstein's theory of general relativity, where a spinning object such as the Earth will push spacetime in front of it. Gravity Probe B uses gyroscopes which will shift direction while orbiting the Earth (if general relativity is correct). The broadcast contains comments from a scientist who has ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Physics, Space science
 
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Groundwater plays a central role in the environment and many communities around the world depend on it. This radio broadcast explores the importance of groundwater in our lives. Most freshwater resources are stored naturally as groundwater, a substantial portion of the public water supply is taken from this source, and in drier regions, many communities are totally dependent upon it. Although totally ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Environmental science, Hydrology
 
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The dust around us is composed of bits of detritus of all manner of things, but it is mostly bits of human skin. This radio broadcast explores the universe through tiny dust particles and discovers what it can tell us about our past as well as our future. The broadcast discusses dust from ice cores that reveal the climate record and the cosmic dust that Earth is gathering every day. There is also ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Atmospheric science, Climatology, Environmental science, Space science
 
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The runoff of fresh water from melting glaciers into the North Atlantic could alter the climate of North America and Europe, according to experts. Global warming has substantially increased the amount of fresh water running into the northern Atlantic Ocean over the past few decades, a change that also affects global ocean currents. This radio broadcast explains how freshwater runoff is already affecting ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology, Physical oceanography
 
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Astronomers have found a new planet that is more like Earth than the other extrasolar planets found before, which were large and gaseous. This radio broadcast reports on this newly discovered planet, which appears to be small and rocky. The new terrestrial planet is extremely hot as it orbits very close to its star, Gliese 876. The clip is 1 minute and 58 seconds in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Space science
 
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Results 41 - 50 of 98 <<  1 2 3 4 5 6 7 8 9  >>