Wonderful item on BBC Radio 4 Today. Report on an experiment begun in 1927 to test the viscosity of pitch. (at about 2hrs 18 mins in). "At room temperature pitch feels solid - even brittle - and can easily be shattered with a blow from a hammer. It's quite amazing then, to see that pitch at room temperature is actually fluid!" "In 1927 Professor Parnell heated a sample of pitch and poured it into a glass funnel with a sealed... Read more →