Sir Marcus "Mark" Laurence Elwin Oliphant AC KBE (8 October 1901 – 14 July 2000) was an Australian physicist and humanitarian who played a fundamental role in the first experimental demonstration of nuclear fusion and the development of the atomic bomb.
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Portraits in Science interviews (1994) 
- Quotes from interviews with Hazel de Berg (24 July 1967), and Ann Moyal (December 1992), published in Portraits in Science (1994) by Ann Moyal
- We were able to discover two new kinds of atomic species, one was hydrogen of mass 3, unknown until that time, and the other helium of mass 3, also unknown. … We were able to show that heavy hydrogen nuclei, that is to say the cores of heavy hydrogen atoms, could be made to react with one another to produce a good deal of energy and new kinds of atom. …Of course, we had no idea whatever that this would one day be applied to make hydrogen bombs. Our curiosity was just curiosity about the structure of the nucleus of the atom, and the discovery of these reactions was purely, as the Americans would put it, coincidental.
- On his research on atomic nuclei with Ernest Rutherford, p. 24
- I, who had been in favour of nuclear energy for generating electricity … I suddenly realised that anybody who has a nuclear reactor can extract the plutonium from the reactor and make nuclear weapons, so that a country which has a nuclear reactor can, at any moment that it wants to, become a nuclear weapons power. And I, right from the beginning, have been terribly worried by the existence of nuclear weapons and very much against their use.
- On potentials for misuse of nuclear power, p. 31
- I was a member of a group that was led by Niels Bohr, after the test in Alamogordo, that was very much opposed to the use of this new weapon on civilian cities. ... But by and large we were in a minority, but a rather distinguished minority. But the trouble was that this second memorandum to Roosevelt went off to him, but he never read it, he died before he read it. And Truman, of course, was a different kettle of fish.
- On efforts to avoid civilian deaths in the first uses of atomic weapons, p. 32
- I've lost any belief I ever had in scientific policy. I don't think you can have scientific policy. I think science is something like weeds, it just grows of its own accord … and if you've got the right atmosphere, the right situation within universities or within places like CSIRO, then it grows and develops of its own accord. And I believe that science is best left to scientists, that you cannot have managers or directors of science, it's got to be carried out and done by people with ideas, people with concepts, people who feel in their bones that they want to go ahead and develop this, that, or the other concept which occurs to them.
- p. 34