When Grandpa Was A Boy, Were There Any Dinosaurs?

Precise Number

1938: The British astrophysicist Sir Arthur Eddington announced that he had calculated the precise number of protons in the universe:
15,747,724,136,275,002,577,605,653,961,
181,555,468,044,717,914,527,116,709,
366,231,425,076,185,631,031,296.

Source: Sir Arthur Eddington, The Philosophy of Physical Science (1939), p. 170

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