In this week's programme Professor P. M. S. Blackett , F.R.S., talks about cosmic rays; and Professor C. A. Lovatt Evans , F.R.S., about the heart as a pump
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In this week's programme Professor P. M. S. Blackett , F.R.S., talks about cosmic rays; and Professor C. A. Lovatt Evans , F.R.S., about the heart as a pump