By monitoring time variations in the laser beams, it is possible to search for the effects of gravitational waves. (newscientist.com)
This is the first time a variation on the texture has been used on the metal body itself. (pocket-lint.com)
We use a model of self - selection to estimate the effect of taking an online course, using region and time variation in Internet service as a source of identifying variation. (caldercenter.org)