Topic: Physical Science

Weathering and erosion

Science Middle School

Beach Erosion Threatens Infrastructure

Earth and Space Science Environment Geography Ecosystems Physical Science Human Impacts Oceans

What happens when human structures and nature come into conflict? Ocean Beach in San Francisco is naturally eroding, but the consequence of this shifting shoreline is that a sewage treatment plant is put in peril. Without intervention, raw sewage could be dumped into the ocean. A rock wall has temporarily stabilized the pipeline, but not without complications. Listen to learn about the other solutions that are being considered, including construction of an artificial dune.

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Using grass for electricity

Science Middle School

Burning Grass for Alternative Electricity

Life Science Earth and Space Science Environment Ecosystems Physical Science

Energy experts are thinking about ways to replace coal that’s burned in American power stations. One alternative is to burn plants because they can produce fewer greenhouse gas emissions. This results in biomass power. Listen to learn about a movement in the Midwest that uses millions of acres of grass for biomass power.

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Wind chill factor

Science Middle School

Calculating the Wind Chill Factor

Earth and Space Science Weather and Climate Physical Science

Before World War II, a wind chill table and a formula were developed which scientists followed until it was updated at the beginning of the 21st Century. Scientists are still trying to understand the best way to calculate wind chill. Listen to learn from people who often experience cold temperatures and how some factors can affect how cold we feel more than others.

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Energy of ecosystems

Science Middle School

Industrial Scale Composting

Life Science Ecosystems Physical Science Energy Ecology

Students in Bellingham, Washington, pushed to introduce composting programs at their high schools and these programs have proved successful. This story follows food from the school cafeteria to the compost site where microorganisms transform it to home gardens and nurseries where compost is applied as fertilizer and mulch. Listen to hear from an insider's view of an industrial scale composting site and how we can learn how to compost.

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Rare earth elements

Science Middle School

China Owns Most Rare Earth Elements Used in Electronics

Technology Environment Physical Science Energy Geology

Rare earth minerals are very important to today's electronics. Your iPod, laptop, and television use them. They make electronics light so they don't need much power. But the Chinese have a lock on the production of rare earth elements and this could become a problem for the US.

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Mimicking a beetle

Science Middle School

Biomimicry and a Desert Beetle

Life Science Earth and Space Science Engineering Physical Science Ecology

To copy the way a desert beetle gets water, scientists have designed a membrane that can extract water from the air. Since all air contains water, even in the desert, this could provide a very inexpensive way to supply drinking water. This process is called “biomimicry,” or using ideas from nature to solve technological problems. This discovery could lead to reusable water bottles that refill themselves. Listen to learn why this invention would be inexpensive and how close scientists are coming to making it work.

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Mosquitoes and raindrops

Science Middle School

Mosquitoes and Raindrops

Life Science Physical Science

Researchers are trying to figure out how mosquitoes survive raindrops. The mosquitoes receive a pelting as if, on a human scale we were being hit with massive boulders! The study of physics is helping scientists figure out this mystery. Through momentum and impulse, mosquitoes can dodge the rain and the humans trying to kill them. Listen to learn what experiments researchers had to do to understand the feeling from a mosquito's point of view.

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Energy in the future

Science Middle School

Low

Improving Battery Storage

Technology Engineering Physical Science Energy Electricity

Energy and how it converts to power is a never-ending exploration for scientists. The most significant issue concerning energy right now is how to store it, especially for long periods of time. It's possible to get solar energy from the sun, but what happens to the energy when it's not a sunny day? There's also the problem of having enough space to hold all of this energy. Listen to learn how scientists are trying to figure out how energy can be stored long-term to power the things we use every day.

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Cloud seeding

Science Middle School

Cloud Seeding for Weather Modification

Earth and Space Science Environment Weather and Climate Physical Science Agriculture Energy

There is a debate over whether cloud seeding is an efficient way to produce more snow and rain in places where droughts are the worst. Opponents claim that the chemicals that are sprayed into the air to create more water are toxic and could cause health issues in the future. Others believe this is the only way to for some gas and electric companies to obtain more energy. Listen to learn about the other concerns at hand and if this the history of this process.

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Fighting gravity

Science Middle School

Gravity's Strong Pull is Actually a Weak Force

Earth and Space Science Physical Science Forces and Newton's Laws

Even though it is the weakest of all forces, gravity is why we exist. Gravity keeps the earth, moon, and sun in orbit. It keeps us on the ground instead of floating in space. Listen to hear how gravity affects the velocity in rockets, the shapes of planets, the trajectories of baseballs, and even the strength of the human leg bones.

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