One notable program is "Cotton. From Blue to Green," launched in 2006 by Cotton Incorporated. The program targets college students, educating them about the renewable attributes of denim and encouraging them to donate their old jeans to the cause. Students can drop their jeans in campus collecti...
In 1989, two researchers announced that they had created a fusion reaction at room temperature. The excitement turned to disappointment when other researchers who tried to duplicate the experiments were unable to reproduce the results, or else concluded that they were caused by experimental errors. N...
Our ears are sufficiently sensitive that they're capable of differentiating between variations in sound equivalent to less than one-billionth of atmospheric pressure, and our brains have the ability to identify and memorize complex aural patterns [sources: GSU, CNRS]. That ability probably evolved ...
As of yet, the only practical solution to this efficiency problem is to install more solar panels over larger areas, but this greatly increases the cost of creating a solar farm in both real estate and natural resources. From a monetary standpoint, solar used to be one of the most expensive...
There are other losses as well. Electrons have to flow from one side of the cell to the other through an external circuit. We can cover the bottom with a metal, allowing for good conduction, but if we completely cover the top, then photons can't get through the opaque conductor and we...
The shorter the leaf spring, the closer to the bottom it will be, giving it the same semielliptical shape a single leaf spring gets from being thicker in the middle. Leaf springs also have different ends, depending on where they're connected to the frame. On double-eye leaf springs, the...
There are other losses as well. Electrons have to flow from one side of the cell to the other through an external circuit. We can cover the bottom with a metal, allowing for good conduction, but if we completely cover the top, then photons can't get through the opaque conductor and we...
There are other losses as well. Electrons have to flow from one side of the cell to the other through an external circuit. We can cover the bottom with a metal, allowing for good conduction, but if we completely cover the top, then photons can't get through the opaque conductor and we...
This electric field acts as a diode, allowing (and even pushing) electrons to flow from the P side to the N side, but not the other way around. It's like a hill — electrons can easily go down the hill (to the N side), but can't climb it (to the P side). When light, in...
Type Ia supernovae are thought to be responsible for the large amount of iron in the universe. And all of the elements in the universe that are heavier than iron, from cobalt to roentgenium, are thought to be created during core collapse supernovae explosions. After millions of years, ...