I thought Brutium killed Cesium? Ron/W6XY ________________________________ From: Craig Sawyers <c.sawyers at tech-enterprise.com> To: greenkeys at mailman.qth.net Sent: Friday, January 9, 2009 2:22:19 AM Subject: Re: [GreenKeys] Accurate clocks... > AHH yes now I recall... Cesium. > That is the element that is accurate to one second over 400 years.