Famous quotes containing the words single and/or species:
“I would strenuously urge a single term of six years.”
—Rutherford Birchard Hayes (1822–1893)
“The question that will decide our destiny is not whether we shall expand into space. It is: shall we be one species or a million? A million species will not exhaust the ecological niches that are awaiting the arrival of intelligence.”
—Freeman Dyson (b. 1923)