A review of the sciences.
Introduced by Colin Riach.

Change and Decay
Europe's heritage of pictures, statues, and buildings is being destroyed at a frightening rate by atmospheric pollution, but an American scientist has just invented a method of preserving limestone which conservationists hope will change the situation radically.
With Dr. Seymour Z. Lewin of the New York Institute of Fine Arts; Dr. H.J. Plenderleith, Director of the International Centre for the Study of the Preservation and Restoration of Cultural Property; John Papaioannou, Architect

Meteorite Mystery
In 1908 a vast explosion shook the Tungus district of Siberia: was it due to the biggest meteorite ever to hit the earth, or something odder? The Russians, after sending out many expeditions, have just released a filmed report.