At Purdue University in Indiana, scientists are working on a reactor-like device that uses water circulated by gravity to keep the core cool.
CNN: Today/Tomorrow - Helping nuclear plants keep their cool
New Orleans lies between the lake's water and the Earth's center where gravity wants that water to go.
Hydro dams can be reversed and pump water uphill so that the next day, when gravity pulls the water back down, the turbines spin to make electricity.
It uses so-called passive systems for cooling, such as the gravity flow of water and natural circulation based on thermodynamics.
Even if that could be done, gravity would cause water to flow down the kite string onto the silk cord, ruining its insulating power.
Gravity pulled the water into New Orleans streets and kept it diving into basements and subbasements, stopping only when it reached the most solid rock at the lowest levels beneath the city.
Maybe it was a great hank of river weed turning below in the cold current, maybe it was just the way gravity works in water, but it felt like something that matched me exactly, the same shape and weight and volume, and it always seemed as if that something came to life the moment I stepped into the water.
Two are university programs, like AguaClara, a research program at Cornell University that produces municipal water treatment technology which relies on gravity rather than electricity.
And there is no indication that the reason why decaying dams are found at each point where the town brook falls ten feet is because there used to be a dozen factories on its banks using the gravity power of falling water to turn out a variety of industrial products.
We have the perfect balance of gases, gravity, solar radiation, water and nutrients to sustain life.
If local gravity differences are not pulling water about to create these features, then other factors such as currents, winds and tides must be responsible.
"The Ariad position is equivalent to discovering that gravity is the force that makes water run downhill and then demanding the owners of all the existing hydroelectric plants begin to pay patent royalties on their use of gravity, " says Armitage.
D. student Roxana Leontie developed a program that would allow the robot to carry items without stable centers of gravity say, bottles of water or half-filled bags of pet kibble.
But Hurricane Katrina produced forces that overcame the levees and unleashed gravity's power upon Pontchartrain's water.
Those gravity-defying levees, along with pumping stations designed to move water away from the center of the Earth, kept the city pretty darn dry.
The gravity-based system responded as it was designed to, circulating water and steam in a continuous loop to keep the scale-model reactor at a safe temperature automatically.
CNN: Today/Tomorrow - Helping nuclear plants keep their cool
They constructed levees that, in all but the most extreme circumstances, overcame gravity's force and held back hundreds of millions of tons of water that would otherwise seek a route to the Earth's core via New Orleans.
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