Re: Converting to old fashioned units
"Baumgartner jumped from an altitude of 29,455m (96,640ft), hitting 586.92km/h (364.69mph)" and "in a pressurised 1,315kg (2,899lb) capsule".
No. Nobody measured the height to a precision of a metre, or speed to a precision of .01 km/h. If you quote two significant figures for a number, you're within one percent. Stop there. Expressing a round number in one system of units as a number with many significant figures in another implies a level of precision that almost certainly wasn't there in the original measurement.
There's the old joke about the curator in the museum who was asked how old the dinosaur skeleton was, and said "66 million and 4 years". When the visitor expressed surprise they knew the age that precisely, the curator said, "Well, when I started here they said it was 66 million years old, and I've been working here four years now."
I am always amazed in debates about metrication in Britain and the US that nobody looks at what happened in Australia. The sky didn't fall in, people. Really it didn't.