Sounds of the Stone Age. Do ancient stone circles and burial chambers have unique acoustic properties that give rise to strange psychological effects? In the first of afour-part series, Aubrey Manninggoes on the trail of the archaeologists who are testingthe theory and investigating whether our ancestors were using strange properties of sound in these magalithic cathedrals as part of their rituals 5,000 years ago. Producer Pam Rutherford. E-MAIL: scirad@bbc.co.uk