It was fun listening to Melvyn Bragg trying to get to grips with the ineffable mysteries of bird migration. The facts don't seem to have changed much since I taught the subject, decades ago, although there are now many more of them. And almost all of those facts are clearly enough to make even Lord Bragg's mind boggle, as we heard throughout the show. But I kept waiting for one of the guests to make one key point.
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