He said that science was entering a period of "unprecedented experimental control" of light and matter.

BBC: NEWS | Science/Nature | Cool clouds turn light to matter

General results have shown that students from the experimental group gained more than those from control group.

UNESCO: WEF ( Grassroots stories > Haiti

Such fine control would be employed in certain experimental set-ups in space where precise positioning of a craft was essential.

BBC: NEWS | Science/Nature | Table-top fusion 'demonstrated'

Andrews Experimental Forest and Biosphere Reserve, thus serving as a large control area for research.

UNESCO: Biosphere Reserve Information

He enriched the oxygen or the carbon dioxide in the air breathed by experimental subjects and found not a hint of suppression or exacerbation of yawning compared with control subjects breathing normal air.

WSJ: Matt Ridley on Why You Just Yawned | Mind & Matter