Famous quotes containing the words demand and/or test:
“The health of the eye seems to demand a horizon. We are never tired, so long as we can see far enough.”
—Ralph Waldo Emerson (1803–1882)
“Experimental work provides the strongest evidence for scientific realism. This is not because we test hypotheses about entities. It is because entities that in principle cannot be ‘observed’ are manipulated to produce a new phenomena
[sic] and to investigate other aspects of nature.”
—Ian Hacking (b. 1936)