"Right behind that is this blast wind that goes back-and-forth, causing the head to swing back-and-forth on the neck, like a bobblehead, very quickly," Goldstein explained.
The mirrors bounce the photons back and forth, causing them to hit other electron-hole pairs, which in turn stimulates the emission of further photons that emerge from the device in the form of a beam of pure colored light.
At the end of the Aggie War Hymn, fans sway back and forth, causing the upper deck of the stadium to move.
Nedin suggested in 1999 that the animal was capable of taking heavily armored trilobites apart, possibly by grabbing one end of their prey in their jaws while using their appendages to quickly rock the other end of the animal back and forth, causing the prey's exoskeleton to rupture and allowing the predator to access its innards.
As the shoes rub or slip against the foot, they pull-the skin back and forth, causing the outer layer of skin to separate from the inner layer, creating a pocket that becomes a blister.
Chaotic variations in the overall reaction rate during the oxidation of propylene in air are caused by a back-and-forth movement of a temperature front emanating from either one of the supports.
His back-and-forth upbringing caused him to develop an affinity for the countries' shared pastime of baseball, which he claims has helped him communicate across both cultures.
Almost all of the extrasolar planets discovered so far have been detected indirectly -- their gravitational pull causes their parent stars to wobble back and forth, which causes a slight wobble in the wavelength of light coming from the stars.
Even before the disclosure of Mr. Bush's decision, the drilling issue caused a heated back-and-forth on the campaign trail on Tuesday, as Mr. McCain sought to straddle the divide between environmentalists and the energy industry, while facing accusations from his Democratic opponent, Senator Barack Obama, that he had flip-flopped and capitulated to the oil industry.
When he used the iBOT's stand-up function in his kitchen to reach for high shelves, the back and forth motion caused by the front wheels' rolling up and over the rear ones took up so much room that his wife and children had to move into the hallway.
