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"Nothing is rich but the inexhaustible wealth of nature. She shows us only surfaces, but she is a million fathoms deep." — Ralph Waldo Emerson
"Quintessence is no other than a quality which we cannot by our reason find out the cause." — Montaigne
"Here end my trials for the present. The results are negative. They do not shake my strong feelings of the existence of a relation between gravity and electricity, though they give no proof that such a relation exists." — Michael Faraday