“An extension of Planck's ideas, due to Prof. Niels Bohr of Copenhagen, went on to suggest that… the ultimate particles of matter would be seen to move not like railway trains running smoothly on tracks, but like kangaroos hopping about in a field.”
Physics and Philosophy (1942)
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James Jeans 54
British mathematician and astronomer 1877–1946Related quotes

“It is natural for a train to run on its tracks.”
Sivakozhundu of Tiruvazhundur (1939)
Context: It is natural for a train to run on its tracks. We get into a train because we believe that it will do that. But once in a while the train runs off the rails, and there’s an accident. Those who don’t actually witness such a happening can say, “No train will run off the rails, it is unnatural for it to do so”.

Nicholas Sparks, Chapter 12, p. 206
2000s, Three Weeks with My Brother (2004)
"Loop Quantum Gravity," The New Humanists: Science at the Edge (2003)