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Every wonder what a dinosaur sounded like? This radio broadcast reports on how computer scientists are now running computer programs to determine just what sounds could have been produced by a recently uncovered skull of a duck billed dinosaur. The scientists create a 3-D model of the dinosaur skull on the computer and simulate how sound waves bounce in the nasal passages. The clip is 2 minutes in ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Paleontology
 
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By building up huge reservoirs of water over the last 45 years, humans have altered the weight distribution around the globe - and the length of time the earth takes to rotate. This radio broadcast reports on that effect, and also the fact that the Earth has been tilted by the reservoirs, which could alter the climate in the distant future. The clip is 2 minutes in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology, Geophysics
 
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Some scientists say the universe is 10 billion years old; others say it is 20 billion. The problem is that different methods of measuring give different answers. This radio broadcast considers 2 methods: determining the age of stars; and determining the speed and distance of stars. The conflict in the two methods points to possible problems in the theory of the expanding universe or the lifetime of ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Space science
 
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The rings on a tree tell a tale - each ring holds clues about that particular year. This radio broadcast reports on an archaeologist who is using the rings to date events in ancient history. This method produces an unconventional date for the Thera volcano eruption, which may cause a rewriting of Mediterranean history. The clip is 2 minutes in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Geologic time
 
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When something breaks into the atmosphere of Earth it makes a thundering boom. This radio broadcast reports on how scientists listen for these noises in order to track dangerous meteors. For example, Los Alamos pressure sensors set up to listen for underground nuclear testing can also be used to track meteors. The clip is 2 minutes in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Atmospheric science, Natural hazards, Space science
 
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This radio broadcast considers the possibility that the current Ice Age was triggered when Panama rose up out of the sea to join North and South America, thereby separating the Atlantic and Pacific Oceans. There is an explanation of how this affected, in turn, the oceans, the Arctic, and ultimately the entire planet. The clip is 2 minutes in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Geology
 
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A year of drought can quickly destroy an otherwise healthy crop. This radio broadcast reports on research into the correlation between the periodic warm spells in the Eastern Pacific (El Nino) and droughts in Zimbabwe the next year. Scientists may be able to give farmers some advance warning about droughts using this research. The clip is 2 minutes in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Agricultural science, Climatology, Natural hazards
 
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The Sahara Desert conjures up images of a practically unlivable, hot, dry expanse of land. But a geologist believes that it may not always have been that way- there may have been many interludes in the history of the Sahara where the climate was semi-arid to relatively humid and during those periods of time it was a grassland and there were millions of animals. This radio broadcast explains how the ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology, Geology, Technology
 
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Glaciers have layers and layers of ice that hold clues about the climate on Earth for the past 250,000 years. This radio broadcast reports on research on ice cores that reveal temperature changes and the level of greenhouse gases in the past. The clip is 2 minutes in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology, Cryology
 
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Most scientists agree that human activities are causing the global climate to heat up. However, in this radio broadcast, two scientists from Alaska explain how nature still has a big say in how much the Arctic heats up and that recent warming is part of a natural cycle, occurring over thousands of years. The clip from 2005 is 3 minutes and 54 seconds in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology
 
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Results 31 - 40 of 117 <<  1 2 3 4 5 6 7 8  >>