“If one compares the sequence of amino acids that go to form the protein haemoglobin, it becomes apparent that humans and chimps are identical and do not differ in a single site …”

Source: The Crucible of Creation (1998), p. 151.

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Simon Conway Morris28

British palaeontologist 1951

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“It is amazing that in spite of the differences between human beings, they can become as one in a single instant or they can be millions, and they can be a million strong just through their ideas.”

Fidel Castro (1926–2016) former First Secretary of the Communist Party and President of Cuba

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Context: Man is born egotistical, a result of the conditioning of nature. Nature fills us with instincts; it is education that fills us with virtues. Nature makes us do things instinctively; one of these is the instinct for survival which can lead to infamy, while on the other side, our conscience can lead us to great acts of heroism. It doesn’t matter what each one of us is like, how different we are from each other, but when we unite we become one.
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“Human nature, human nature acts as it acts when it is identified when there is an identity but it is not human nature that has anything to do with that it is that anybody is there where they are, it is that that has to do with identity, with government and propaganda with history with individualism and with communism but it has nothing nothing to do with the human mind … because the human mind writes what there is and what has identity go to do with that … nothing at all.”

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“The chemistry of genetics is primarily the chemistry and structure of the hereditary nucleic acid chains, DNA and RNA, and of the proteins whose structure they in turn control and the mechanism of this control.”

John R. Platt (1918–1992) American physicist

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“All contradictory things are interconnected; not only do they coexist in a single entity in given conditions, but in other given conditions, they also transform themselves into each other. This is the full meaning of the identity of opposites. This is what Lenin meant when he discussed "how they happen to be (how they become) identical--under what conditions they are identical, transforming themselves into one another."”

Mao Zedong book On Contradiction

Selected Readings from the Works of Mao Tse-Tung, pp. 121
On Contradiction (1937)
Original: (zh-CN) 一切矛盾着的东西，互相联系着，不但在一定条件之下共处于一个统一体中，而且在一定条件之下互相转化，这就是矛盾的同一性的全部意义。列宁所谓“怎样成为同一的（怎样变成同一的），——在怎样的条件之下它们互相转化，成为同一的”，就是这个意思。