"The present challenge to physicists seeking to discover how things really are is to investigate our environment on a scale known as the 'Planck length'. Rovelli tries to convey just how small this is. Imagine, he says, a walnut magnified until it is the size of the universe. If we were to magnify the Planck length by that much, we still couldn’t see it. 'Even after having been enormously magnified thus, it would still be a million times smaller than the actual walnut shell was before magnification,' he tells us."
Michael Brooks, book review, "Has this physicist found the key to reality?" New Statesman, Oct. 21, 2016.
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