If you were to enter the black hole at the center of our galaxy ... 'you easily pass into it without disruption and find it had the density of air ... but you would find yourself unable to return ...'. Which is a crude paraphrase of John Barrow speaking on the speed of light for In Our Time. There's lots more like that, such as "information cannot travel faster than the speed of light", which is a bit different from the way that law has been traditionally expressed.
I was thinking that, even for IOT, this was a rather erudite and interesting guest. The wikipedia profile explains things.
Another excellent episode, but of course no longer available as a podcast. If you don't like that, then help liberate In Our Time. In the meantime, maybe you should start collecting the podcasts ...
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