Transcription: The pool is five feet deep, eighty feet by thirty, six columns going down and then just about where we have the windows there they have what we call a clerestory. That's glass. The Romans had glass so it would have looked the place. Now box tiles are hollow. They're also marvellous for insulation. So two thousand years ago the Romans had central heating and the equipment to cavity insulation. And there are homes in Britain to this day that don't have either.
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