Lead/compounds

Famous quotes containing the words lead and/or compounds:

“When one has come to accept a certain course as duty he has a pleasant sense of relief and of lifted responsibility, even if the course involves pain and renunciation. It is like obedience to some external authority; any clear way, though it lead to death, is mentally preferable to the tangle of uncertainty.”
—Charles Horton Cooley (1864–1929)

“We can come up with a working definition of life, which is what we did for the Viking mission to Mars. We said we could think in terms of a large molecule made up of carbon compounds that can replicate, or make copies of itself, and metabolize food and energy. So that’s the thought: macrocolecule, metabolism, replication.”
—Cyril Ponnamperuma (b. 1923)