For information, and to point out an interesting use of the web for chemistry The BBC is airing some "periodic tales" on Radio 4. Familiar Radio 4 voices introduce elements from the Periodic Table and the unique roles they play in human existence - with a little help from the irreverent Tom Lehrer. Here is the address to listen in on ten elements: http://www.bbc.co.uk/radio4/science/periodictales.shtml Krypton: Heidli Nicklaus on the Superman element, krypton Helium: Brian Perkins dramatises the effects of Helium. Silver: Trevor Harrison (Eddie Grundy in the Archers) finds some unusual properties of Silver. Cobalt: Hedli Nicklaus (Cathy Perks) takes on the goblin element of cobalt. Selenium: Carole Boyd (The Archers' Linda Snell) unearths selenium. Oxygen: Brian Perkins bravely dramatises the effects of oxygen. A rsenic: Charlotte Green takes on the deadly history of a rsenic. Mercury: Carole Boyd (Linda Snell) reflects on mercury, the poisonous liquid metal. Iodine: Charlotte Green on the discovery of iodine's essential place in brain development. Nickel: Trevor Harrison reveals that the space station Mir is largely made of nickel. Regards -- Dr Mark J Winter Department of Chemistry, The University, Sheffield S3 7HF, England tel: +44 (0)114 222 9304 fax: +44 (0)114 222 9303 e-m: mark.winter@sheffield.ac.uk http://www.shef.ac.uk/chemistry/staff/mjw/mark-winter.html WebElements is the periodic table on the world-wide web: http://www.webelements.com/ The Sheffield Chemdex is a listing of chemistry sites on the world- wide web: http://www.chemdex.org/