"Lewis Thomas" was an United States/American physician, poet, etymologist, essayist, administrator, educator, policy advisor, and researcher.

Thomas was born in Flushing, New York and attended Princeton University and Harvard Medical School. He became Dean of Yale Medical School and New York University School of Medicine, and President of Memorial Sloan-Kettering Cancer Center/Memorial Sloan-Kettering Institute. His formative years as an independent medical researcher were at Tulane University School of Medicine.

He was invited to write regular essays in the New England Journal of Medicine. One collection of those essays, The Lives of a Cell: Notes of a Biology Watcher (1974), won annual National Book Awards List of winners of the National Book Award#Arts and Letters/in two categories, Arts and Letters and The Sciences (both awards were split).

[http://www.nationalbook.org/nba1975.html "National Book Awards – 1975"]. National Book Foundation. Retrieved 2012-03-05. (With acceptance speech by Thomas.)

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The cloning of humans is on most of the lists of things to worry about from Science, along with behaviour control, genetic engineering, transplanted heads, computer poetry and the unrestrained growth of plastic flowers.

Worrying is the most natural and spontaneous of all human functions. It is time to acknowledge this, perhaps even to learn to do it better.

The capacity to blunder slightly is the real marvel of DNA. Without this special attribute, we would still be anaerobic bacteria and there would be no music.

It is from the progeny of this parent cell that we all take our looks; we still share genes around, and the resemblance of the enzymes of grasses to those of whales is in fact a family resemblance.

We are, perhaps, uniquely among the earth's creatures, the worrying animal. We worry away our lives, fearing the future, discontent with the present, unable to take in the idea of dying, unable to sit still.

The act of smelling something, anything, is remarkably like the act of thinking. Immediately at the moment of perception, you can feel the mind going to work, sending the odor around from place to place, setting off complex repertories through the brain, polling one center after another for signs of re recognition, for old memories and old connection.

The uniformity of earth's life, more astonishing than its diversity, is accountable by the high probability that we derived, originally, from some single cell, fertilized in a bolt of lightning as the earth cooled.

The great secret of doctors, known only to their wives, but still hidden from the public, is that most things get better by themselves; most things, in fact, are better in the morning.

The great thing about human language is that it prevents us from sticking to the matter at hand.

We pass the word around; we ponder how the case is put by different people, we read the poetry; we meditate over the literature; we play the music; we change our minds; we reach an understanding. Society evolves this way, not by shouting each other down, but by the unique capacity of unique, individual human beings to comprehend each other.

We are a spectacular, splendid manifestation of life. We have language. . . . We have affection We have genes for usefulness, and usefulness is about as close to a 'common goal' of nature as I can guess at. And finally, and perhaps best of all, we have music.

Statistically the probability of any one of us being here is so small that you would think the mere possibility of existence would keep us all in a contented dazzlement of surprise.

Ants are so much like human beings as to be an embarrassment. They farm fungi, raise aphids as livestock, launch armies into war, use chemical sprays to alarm and confuse enemies, capture slaves, engage in child labor, exchange information ceaselessly. They do everything but watch television.

The only solid piece of scientific truth about which I feel totally confident is that we are profoundly ignorant about nature... It is this sudden confrontation with the depth and scope of ignorance that represents the most significant contribution of twentieth-century science to the human intellect.