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Intelligence is based on how efficient a species became at doing the things they need to survive.

Charles Darwin

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Charles Darwin
Age: 73 †
Born: 1809
Born: February 12
Died: 1882
Died: April 19
Beekeeper
Botanist
Carcinologist
Entomologist
Ethologist
Explorer
Geologist
Naturalist
Philosopher
Travel Writer
The Mount
Shrewsbury
Charles Robert Darwin
Charles R. Darwin
Darwin
Became
Based
Inspirational
Need
Needs
Efficient
Things
Survive
Species
Intelligence

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Man in his arrogance thinks himself a great work, worthy the interposition of a great deity. More humble and I believe true to consider him created from animals.
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We will now discuss in a little more detail the Struggle for Existence.
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Progress has been much more general than retrogression
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The fact of evolution is the backbone of biology, and biology is thus in the peculiar position of being a science founded on an improved theory, is it then a science or faith?
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It is always advisable to perceive clearly our ignorance.
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Jealousy was plainly exhibited when I fondled a large doll, and when I weighed his infant sister, he being then 15? months old. Seeing how strong a feeling of jealousy is in dogs, it would probably be exhibited by infants at any earlier age than just specified if they were tried in a fitting manner
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The chief distinction in the intellectual powers of the two sexes is shown by mans attaining to a higher eminence, in whatever he takes up, than the woman. Whether deep thought, reason, or imagination or merely the use of the senses and hands.....We may also infer.....The average mental power in man must be above that of woman.
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On seeing the marsupials in Australia for the first time and comparing them to placental mammals: “An unbeliever . . . might exclaim 'Surely two distinct Creators must have been at work'”
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I have steadily endeavored to keep my mind free so as to give up any hypothesis, however much beloved (and I cannot resist forming one on every subject), as soon as the facts are shown to be opposed to it.
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A man who dares to waste one hour of time has not discovered the value of life.
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I was a young man with uninformed ideas. I threw out queries, suggestions, wondering all the time over everything and to my astonishment the ideas took like wildfire. People made a religion of them.
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The lower animals, like man, manifestly feel pleasure and pain, happiness and misery. Happiness is never better exhibited than by young animals, such as puppies, kittens, lambs, &c., when playing together, like our own children.
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I have long discovered that geologists never read each other's works, and that the only object in writing a book is a proof of earnestness.
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We have seen that the senses and intuitions, the various emotions and faculties, such as love, memory, attention and curiosity, imitation, reason, etc., of which man boasts, may be found in an incipient, or even sometimes in a well-developed condition, in the lower animals.
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Only picture to yourself a nice soft wife on a sofa with good fire, & books & music.
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As natural selection works solely by and for the good of each being, all corporeal and mental endowments will tend to progress toward perfection.
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...one doubts existence of free will [because] every action determined by heredity, constitution, example of others or teaching of others. This view should teach one profound humility, one deserves no credit for anything...nor ought one to blame others.
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It is absurd to talk of one animal being higher than another...we consider those, where the intellectual faculties most developed as the highest. - A bee doubtless would [use] ... instincts as a criteria.
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Blushing is the most peculiar and the most human of all expressions. Monkeys redden from passion, but it would require an overwhelming amount of evidence to make us believe that any animal could blush.
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Attention, if sudden and close, graduates into surprise and this into astonishment and this into stupefied amazement.
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