Dave, 1. Einsteinium was discovered by a team of scientists led by Albert Ghiorso in 1952. It was confirmed while studying the radioactive debris produced by the detonation of the first hydrogen bomb that was detonated in the South Pacific by Los Alamos Scientific Laboratory. Based on what I've been reading the debris captureed in filter papers was was studied at the UC Radiation Laboratory using chemical separation in a cation-exchange column. 2. Sir Humphry Davy discovered calcium in 1808. I know I'm not the first to answer. But hope I have it correct! Drew --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------