Lead/compounds

Famous quotes containing the words lead and/or compounds:

“None can lead this life who are not almost amphibious.”
—Henry David Thoreau (1817–1862)

“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)