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I left my frogs, which I had grown, with my supervisor, who had moved to Geneva, and he and a technician grew them up. So by 1962, they were adults, and one could publish a paper to say that these animals, derived from nuclear transfer, really were absolutely normal. So it took a little time to get through.

The theory of undirected evolution is already dead, but the work of science continues.

If you're going to have to swallow a frog, you don't want to have to look at that sucker too long!

If you put a frog in boiling water, it'll jump straight out. If you put it in cold water and gradually bring it to the boil, it'll sit right there until it dies. Scotland has been sitting in England's gradually boiling water for so long that many people are used to it.

I think looking back to my own childhood, the fact that so many of the stories I read allowed the possibility of frogs turning into princes, whether that has a sort of insidious affect on rationality, I'm not sure. Perhaps it's something for research.

Theories of evolution must provide for the creative acts which brought such theories into existence.

The progress of science is strewn, like an ancient desert trail, with the bleached skeleton of discarded theories which once seemed to possess eternal life.

The history of science shows that theories are perishable. With every new truth that is revealed we get a better understanding of Nature and our conceptions and views are modified.

I raised frogs every spring in our house from tadpoles and by end of summer our house was overrun with frogs.