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" "Never make a calculation until you know the answer.
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"But some numbers, called dimensionless numbers, have the same numerical value no matter what units of measurement are chosen. Probably the most famous of these is the "fine-structure constant," .... Physicists love this number not just because it is dimensionless, but also because it is a combination of three fundamental constants of nature."
the past has no existence except as it is recorded in the present. (...) we would seem forced to say that no phenomenon is a phenomenon until it is an observed phenomenon. The universe does not 'exist, out there' independent of all acts of observation. Instead, it is in some strange sense a participatory universe
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